4L60E: 1-2 Shift Valve + 1-2 Shift Solenoid (Part 1) Basic Operation

[@SouthpawAutoworks]

Thank you for being here! If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@jonnysprojects6549]

Does this also go for the 4l80e I have codes 81 82 83 👍

[@aliceshearer8740]

I don't know the history of the transmission I just bought the vehicle and it'll go in reverse neutral and first and second gear and that's it

[@SouthpawAutoworks]

Understood. Chances are, the 3-4 Clutch is smoked. Super common problem on this transmission. As the name implies, the 3-4 Clutch is partially responsible for 3rd gear and 4th gear.

[@bradfriedman9398]

I have a 1997 c1500 with 4l60e 1-piece case. Keep getting P0758 and have replaced both A and B shift solenoids. I can command them on /off through PCM and voltage drop occurs …they work . Can mechanical problem in valve body or transmission still cause P0758? No debris or clutch material found in pan …clean with normal metallic sludge on magnet

[@SouthpawAutoworks]

Is the trans missing/skipping 2nd or 3rd gear? What's the history on trans? High mileage unit? Recently rebuilt? To answer your question... Yes, there are mechanical, and hydraulic, problems that can exist in the valve-body, that can cause this code. Shoot me some more info, and I'll see if I can get you pointed in the right direction.

[@dcxplant]

Automatic transmissions have now entered the realm of magic for me. Unreal that you can explain this.

[@SouthpawAutoworks]

I'm in awe that people created these things.

[@uriahplumb5202]

@@SouthpawAutoworks people did not create them, people created machines, machines created them.

[@codemaster3696]

I've only watched this one video of yours and I am coming to the conclusion quickly and I believe you may have the best transmission videos on the internet at least for explaining to the beginner thank you for your service

[@SouthpawAutoworks]

That would be great! Thanks for dropping me a line! PS - If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@johnkufeldt3564]

you could do alot worsethan watching and listening to this channel. Even my girlfriend(not very mechanically inclined)undrstood the content. cheers frrom Calgary.

[@SouthpawAutoworks]

Right on!!

[@WilliamAllen-mc9px]

2 min in video and I agree with you 100%

[@SouthpawAutoworks]

🙏

[@robertjasinski1831]

using that color coding to show the inner workings of the 4L60E transmission is a quality mark of a genius. No hesitations in your explanations and smooth talking puts your web page at the top of the list compared to what i seen in other show and tells. You are the grand master of your intellect for perpetrating such awesome detail to your audience. Kudo's go out to you sir.

[@StaineLaSteele304]

I can't thank you enough to help me understand this type of transmission down to every detail. Transmissions were always a "hands off" thing to me because of their complexity making them so intimidating. Your videos really paid because they make understanding this transmission so easily. I've watched many other videos and they still left me scratching my head. So again sir, thank you for taking the time to make these videos to help people like me get the best understanding and gain the knowledge from a true expert. 👍👍

[@SouthpawAutoworks]

Right on! Glad to hear that. Your interest in this subject is appreciated. Thanks for taking the time to drop me a line. PS I've got plans of making more video content, like this. Just a matter of time...

[@mybuickskill6979]

Same bro, same. Rear end, engine, chassis I can understand but autos are voodoo 🤷🏼‍♂️🤣

[@ricardoandrade9172]

The best in depth explanation video for any transmission I've ever seen👍👍

[@mindylee4167]

I repair valvebodies at gm. Let me tell you these videos have made my job way easier figuring out why a valve was failing

[@SouthpawAutoworks]

Right on!

[@bradjones2480]

Thanks for 'arming' folks with some more knowledge! Seriously, that was well played sir! Great work! I like to teach people the basics in a powershift transmission, which is extremely similar to a complex 'auto' trans, but without any of the valving. Usually 1-3 clutch stacks and a F/R stack. That's it.

[@SouthpawAutoworks]

The positive feedback is appreciated. John Deere power-shift? Right on! Thanks for dropping me a line! PS - If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@johnkufeldt3564]

@@SouthpawAutoworks It took me a few views to fealize thatyou only ha d the one hand, just goes to show that you can fix a tranny with only one hand as long as you have the motivaton to overcome problems in life

[@SouthpawAutoworks]

1 Handed Automatic Transmission Builder: kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@testingtoseeifthisworks10101]

i know nothing about cars, but holy heck this is helpful for understanding these kind of structures.

[@SouthpawAutoworks]

Right on. Glad you enjoyed it.

[@bradfriedman9398]

November 5, 2022- Follow up to my 2nd post. Received the PCM I bought on Ebay ( by Flashmasters) and it fixed the transmission immediately. No more Shift solenoid B Fault and no more default 3rd gear. I was almost defeated after rebuilding an obviously burned up transmission only to install it and have the same fault that I started with. So, pay close attention to your scan tool solenoid open/short to ground/short to volt faults, because it very well could be the PCM. It is natural to assume an old truck has wiring harness issues, but don't overlook the PCM itself . And don't assume your vehicle only has one problem....in this case the tranny was indeed burned up but the PCM was also completely defective, because its internal volt meter was permanently stuck on 0V as it activated and monitored the B solenoid

[@gucciman7137]

Im currently having a shift solenoid b stuck off problem truck feels like it’s in limp mode completely rebuild transmission brand new shift solenoids brand new pcm from flashmasters tested harness from pcm to solenoid wires all check out anything I could be missing???

[@cck1496]

Excellent explanation....No such detailed videos on internet about automatic transmission......This is the best channel for learning automatic transmission....

[@SouthpawAutoworks]

Really appreciate the positive feedback. Thanks for dropping us a line.

[@vazfx16]

You knowledge and ability to communicate is unprecedented!!!!

[@SouthpawAutoworks]

The positive feedback is appreciated. PS - If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@vazfx16]

@@SouthpawAutoworks will do. Thank you again

[@austinwyman427]

New subscriber as of right now. You got me hooked. I do a lot of my own work and I’m playing with the concept of a 4L60E in my race truck instead of the th350 and this just solved my issue.

[@SouthpawAutoworks]

Right on!

[@bradfriedman9398]

Recently I rebuilt the 4l60e I commented on two weeks ago... the 2/4 input drum blue and band slipping (no 2nd or 4th gear) . Now the tranny is rebuilt, both shift solenoids replaced 2/3 shuttle valves inspected (smooth movement in the bore) and I replaced internal tranny wiring harness. But same 2/3 solenoid electrical fault occurs , but now AFTER the 2-3 shift occurs ..... Interestingly I can shift through every gear using scan tool from 1 to 4 and I have every gear going down the road. I can also downshift from 4 to 1 using the scan tool no problem. However, if I clear fault, and start from stop , it will shift from 1st to 2nd and from 2nd to 3rd, then about 2-3 seconds after the shift to 3rd , check engine light comes on and now I'm in failsafe 3rd gear again. (same 2/3 solenoid "B" electrical fault) . Since the 2/3 solenoid is commanded OFF for 3rd gear, I'm thinking this might be a problem inside the PCM, or PCM is not seeing the voltage rise fast enough after solenoid turned off . I can command the 2/3 solenoid on and off with scan tool and I hear it click on / off in the pan every time. Now I am starting to think the 2/4 band and drum originally burned up because previous owner was constantly using manual 2nd to start off and flicking to 3rd, since tranny was in failsafe all the time ( he died, so asking him is out of the question.) . I suspect this because the shift cable was originally misadjusted so that manual valve would only move to manual 2nd and not to manual 1st. You could physically not move it to manual 1st. Not sure what is going on, but definitely going to school on this one.

[@Keithjo74]

Love your videos. So clear with great visual explanations and animations. They are perfect. You obviously put alot more work into your videos than just turning on a recording camera. I'm gonna watch more ot them.

[@SouthpawAutoworks]

Wow, thank you!

[@SeanEpoc]

wow! blown away by the detail, editing, and explanations, thank you

[@SouthpawAutoworks]

Thank you for your comment. Means a lot. Have a great weekend.

[@panomthunya]

GOOD ANIMATIONS caused my clear understanding. Thanks a lot

[@SouthpawAutoworks]

Right on!

[@cicakbalap]

Thank you foe the clear explanation, please explain also about the accumulator, what is the function while several case 4l60e harsh shift 1-2 while the plastic accumulator is tear and wear. Thx

[@PETERHERMANGENE]

I am working on the Allison transmission problem. Tipper TRUCK.

[@TheAdrenaline85]

Instant sub. Never seen your Chanel till today. The best teachings and illustrations I’ve seen by far. ❤love it!!

[@nadirkhan7552]

I loved it.🎉 Watched it in 1.75x and still got everything smooth into my brain 🧠 Now I'll have more proper knowledge while going to the mechanic and resolving my Toyota Harrier / Lexus Rx330 gearbox problem

[@SouthpawAutoworks]

Right on.

[@nadirkhan7552]

@SouthpawAutoworks BTW I got my transmission replaced for the peace of mind 😅 The shifts are smooth, it is just that when I floor the car. The gear takes lag to shift and a bit of aggressive shift. Perhaps can consider this from a V6 engine 3mz

[@tylerevans9231]

Very great information. I plan on using your videos in our class at our Tech Center to help my students understand automatic transmissions. Outstanding. Great visuals.

[@SouthpawAutoworks]

Right on! Happy to hear that. Your positive feedback is appreciated. Thanks for taking the time to drop me a line.

[@CarbonGlassMan]

What an amazingly detailed video. Mine randomly slips while in 4th gear so I got the shift solenoids & torque converter pwm solenoid, hoping that fixes the problem, but I really wanted more information on how those solenoids work and what they do. This video is a big help in understanding how the transmission works. I subscribed.

[@SouthpawAutoworks]

Here's a video dedicated to the shift solenoids. 4L60E Shift Solenoid - Part 1 (Basic Operation): kzbin.info/www/bejne/fJKmmYqjmNh0nas That condition could be caused by a number of things. Hoping to get back to creating more 4L60E videos, soon. Got a lot of different topics to cover, including this one. Currently busy working on a TH400 build series. kzbin.info/aero/PLMK9OC5NGhbgVgAwDO_rCGFF38T1LjkS7 The positive feedback (and the subscription) is appreciated. Thanks for dropping me a line.

[@prestonbrown7652]

I really appreciate all that you do it helps tremendously my question is I recently changed the oil and filter in my 4l60e the reason for this is when I reach 30 mph its like it goes into neutral while I had the pan and off out of the way I was checking out the shift solenoids when I pushed in on them the one closest to the front of the transmission it would come back out on it's own the other one I had to pull it back out is this normal or should they be charged because it is still doing the same thing as before

[@SouthpawAutoworks]

Regarding the solenoids, that's normal. One solenoid is under spring tension. The other is not. If the trans is trying to shift into 3rd gear, and instead of getting 3rd gear, it feels like neutral, chances are that the 3-4 Clutch is failing. As the name implies, it partially responsible for creating both 3rd gear and 4th gear. It's a very common failure point on the 4L60E.

[@tyscott4538]

What's the part number for those solenoids?

[@Dario-h8g]

ive done engine work since i was a kid im hoping i can duplicate my Success in Engines as well as in Transmissions im working on a 1997 astro Van!! Thanks for SHARING!!!!!!

[@SouthpawAutoworks]

Right on! You bet. Thanks for commenting.

[@Dario-h8g]

@@SouthpawAutoworks greetings

[@jonathanb.6800]

My 94 Trans Am's transmission. Manufacturers don't much mention automatics suggested maintenance. Only in rear of an owner's manual,.... Always change old / burnt burnt ATF and filter man. Clean the trans pan with it's magnet too if it's equipped. Great video my fellow southpaw. Care to show the differences when adding a shift-kit? Something about forcing more fluid causing a noticeably harder shift.

[@SouthpawAutoworks]

When time permits, I'd like to dedicate a video to trans maintenance. Plus, add some extra things, that could potentially extend the life of the trans. Some of the extras don't cost much (especially when compared to the cost of an overhaul). Would love to do a video on valve-body kits! Thanks for dropping me a line. I appreciate your interest in this subject.

[@dariomendoza191]

well explained aPic is Worth a thousand Words!!! THanks for Sharing!!

[@SouthpawAutoworks]

My pleasure!

[@AbramKlassen-x6q]

My 4L60 shifts from 1 to third No second or overdrive can’t seem to figure it out can you help It shifts from 1 to 3 when taking it easy but when I give it hard gas it doesn’t want to shift to the next gear unless I let go of the gas pedal

[@davonted93]

Same. Did you figure out what it was?

[@TROYMARKGOOCH]

Great videos mate very easy to follow along. Im currently looking for the reason my silverado 4l60e feels like it slips/hesitates until i add rpm when selecting drive. Seems fine when cold but gets worse as it warms up. Reverse is normal with no issues and the car will drive along fine just slips from a stopped start. Any help would be greatly appreciated 👍

[@kyl75]

Great videos! Best informational videos about how a 4l60e works on youtube!

[@SouthpawAutoworks]

Thank you for taking the time to check it out! Your positive feedback is very appreciated. Thanks for dropping me a line! PS - If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@PETERHERMANGENE]

What causes the Hydraulic oil to mix with the Transmission oil...

[@tamarapipkin7675]

Your videos are so detailed and easy to follow. Thank you!

[@SouthpawAutoworks]

Thanks for stopping by and checking it out! I'm excited for you to get your fitness videos rolling. You're gonna do awesome...I just know it.

[@blackshirtbuilds7316]

Great video and very informative. I have a question… I have a 1995 Camaro that seems to be missing second gear. First gear pulls normal however it won’t shift to second, if you lead off of the throttle it will jump straight to third and then fourth operates totally normal as well. If you step on the throttle enough to where it goes to downshift into second gear it will just rev almost like neutral. Can you help me out diagnosing this? Thanks

[@JeremysCarRepair]

Did you ever figure this out??

[@sergiotinoco4944]

i Really liked this video, my 1-2 shift valve is stuck inside, how can dis happend? can i just try to take it with some cleaner or something? Thanks for all.

[@costarica0904]

Thank you for all your videos, it's very educational. I bought a 2004 Gmc Yukon denali. I'm pretty sure the history on the vehicle I was not giving an honest answer, but I knew that before buy the Yukon. Few days ago I took it up to the mountains and it started to over heat close to 300 degrees. I let it cool down back to normal operation temp. And it didn't over heat go back. Next day I decided to change the trans fluid with filter. Put it back together drove it gave me a p0758 generic right away. 1st 2nd and 3rd react fine, until I put it into D then the speed and rpm do not match. Can you give me some advice of what I can do? Is it solenoid problem.

[@ejhonedon1609]

My Brother I want know about TEREX hydraulic Crane PPM ATT600 ( Electronic switch shifting gear detail please Thank u

[@micahparris5107]

I know this is an older post but I have watched about all of your 4L60E shift solenoid videos. I have questions if you are still around and available.I admire your strong capabilities , you know your stuff. Thanks. Micah Parris

[@SouthpawAutoworks]

Very kind of you. This is the best way to reach me. Please know that I'm typically slow to respond.

[@micahparris5107]

@@SouthpawAutoworks I have replaced A &B solenoids. It was shifting hard into 3rd gear. Now the thing will go through all the gears but will not move reverse or forward , unless the truck temp gets to 210 or so. Then it will move forward just a bit but not reverse.

[@SouthpawAutoworks]

I'm a little confused by what you wrote. Lots of good info, but one thing that I'm not sure about. You said, "Now the thing will go through all the gears but will not move reverse or forward..." When you say this, do you mean that while the engine is idling, and the trans is in Park (and your foot is pushing on the brake), you can move the shifter through all of the different gears, and feel each gear engage (or bump)??? Or do you mean something else. You mentioned that after the trans comes up to temp (210 F), that the truck "will move forward just a bit". When you step on the gas, is the trans slipping (engine RPMs climb, but the truck isn't moving forward as it normally would)?

[@micahparris5107]

@@SouthpawAutoworks oh, sorry. I can move the shifter on the column and underneath at the shifter cable.. Makes me wonder if I lost something when I replaced the A and B solenoids.

[@micahparris5107]

Where can I buy the solenoid and valve and spring???

[@emspares]

Thanks Robert very informative. I have a silverado 4l60e with a problem it selects 1st and 2nd and reverse but when in drive there is nothing.Ive connected launch x431 no fault codes. If i activate shift solenoid 2 with the launch and van runs 100% through all the gears and feels like nothing is wrong. As soon as i turn off and restart there is no drive gear .It sounds like it is in neutral. I pulled the pan and its sparkling clean in there so i doubt its clutch related. Any help would be appreciated

[@miltonscornertobylove5068]

Like your videos, I gain so much info by watching them I have a question what causes transmission fluid to leak out of the breather port? Hopefully to hear from you thanks

[@markschellhaas]

Thanks for the video. im diagnosing a freshly rebuilt 4660e that wont downshift back to first . using this and not having any diagnostic codes i was able to determine my problem is not the 1-2 solenoid. so on to the next video

[@SouthpawAutoworks]

Interesting... If you shift it into Manual 1st ("1" on the shifter), what happens?

[@carlwilson8045]

Great Video, looking forward to all of your videos, I do have an issue that needs explained what is happening, 2004 silverado 4l60E rebuilt about 25K miles ago, I have no codes, I have a fairly hard shift 1 to 2 and from 2 to 3 the engine revs up a bit before nicely shifting into 3rd, I was thinking the TCC Bore was leaking, but there is no code to support this, a good rebuild kit was installed with all new frictions, new sunshield, band, servo's etc... but nothing was done to the valve body as far as I know it was just reinstalled, had this issue for quite a while, I have purchased a rebuilt valve body but have not installed it yet, I am afraid it may be a bit over my head, but watching your video made me a bit more confident. and idea why it would rev anywhere from 5 to 7 hundred rpm before shifting into 3rd? Thank you Much Appreciate any answers.

[@SouthpawAutoworks]

Slipping during the 2-3 up-shift is typically foreshadowing of a 3-4 Clutch failure. There are a number of potential oil leaks in the 3-4 Clutch circuit. This leakage results in lower oil pressures, which results in clutch slippage. When time permits, I'll dedicate a video to this topic. Those elevated RPMs are killing the life of those clutches. If this goes on for too long, the clutches will fail...resulting in a trans failure/rebuild. Hope you can get it figured out soon.

[@randomlife718]

My 4l60e sometimes doesn't shift to first. No codes. New GM solenoids 2 years ago. The the thing is an 05 with 218k though. I know it's wore out. The friction material removed from the pan was ridiculous 2 years ago. The truck has been jumping on startup for months now. I imagine those cluches metal to metal.

[@SouthpawAutoworks]

That is a lot of miles, and friction material in the pan is never a good thing. You might wanna check out this video. Along the same lines... kzbin.info/www/bejne/aqK7oq2Ne7CDf5I

[@randomlife718]

@@SouthpawAutoworks pulled the trans last week. The front left checkball was stuck in the separator plate and the 3/4 clutch teeth were half worn away. Going good now.

[@SouthpawAutoworks]

The front-most check-ball is used during the 1-2 up-shift, and the 2-1 down-shift. It's common for that check-ball to beat up the seat, in the separator plate. It can get stuck in the plate...and if it gets bad enough, it'll even blow completely through the plate. With the check-ball stuck in the plate, it will not prevent a 1-2 up-shift. It will probably delay the 2-1 down-shift. When shifting from Park to D, this check-ball will not be fed any oil. It's only when the trans commands a 1-2 up-shift, that this check-ball goes to work. 3-4 Clutch Plate Teeth: That's common for those to wear. Typically associated with 3-4 clutch failure. You had mentioned it was occasionally missing 1st gear. Was the trans also missing 3rd and 4th gear? Or slipping in those gears?

[@edseeling8736]

I just watched your very informative transmission video on a fl60 12 shift solenoid. The issue I'm having it will not shift into 3rd gear no check engine light, simply will not shift from 2nd to 3rd. My thoughts is I need a new 3-4 shift solenoid. Never had a transmission issue until this happened last week

[@SouthpawAutoworks]

Were you able to get to the bottom of this problem?

[@danielbuckner2167]

Robert, thanks for making this video. Subbed and thumbs up! The animation and narration is clear and top shelf. I think I understand it enough to diagnose a loss of line pressure just before going to 2nd. If I put into drive the PSI is 60 then when I begin to accelerate from a stop it drops to 30psi (yikes) for a second and it feels as though the trans is slipping or really just in limbo as the rpms don't spike. The line pressure goes to 60PSI and it feels like normal and is in 2nd. It does this in overdrive, manual 1st, 3rd, and 4th but not 2nd as it starts off in 2nd. Also of note is if I creep up slowly the rpms when leaving a stop the PSI doesn't drop, it's only when I accelerate normally and only momentarily. I'm guessing this is a sticky 1-2 shift valve or a weak/broken spring on the 1-2 shift valve causing a slow return after the solenoid is commanded off. Any thoughts?

[@SouthpawAutoworks]

The 1-2 shift valve redirects/permits oil flow. In 1st gear, it's a "closed door." When the PCM commands 2nd gear, the valve becomes an "open door," letting oil flow through/past the valve, and to the 2-4 Servo. There are a number of things that affect line pressure: Pump speed (engine RPM), pump volume (pump slide position), PR Valve (affects pump slide), etc. Also, the integrity of a clutch circuit will affect line pressure. Ideally, we want no leaks in any a given circuit. When we have leaks, we lose oil pressure (line pressure). There's more info, on a number of these topics....if you're interested. 4L60E Pump: How Does it Work: kzbin.info/www/bejne/nXuYdJeGf9R9r8k 4L60E PR Valve: Part 1: kzbin.info/www/bejne/e33Le5-Qp86Xf7s Part 2: kzbin.info/www/bejne/mnvPhpiZbpaenbs Part 3: kzbin.info/www/bejne/hoqUpaWQmrGkiq8 4L60E AFL Valve: kzbin.info/www/bejne/gqKlnJebnLWdhM0 4L60E Shift Solenoid: kzbin.info/www/bejne/fJKmmYqjmNh0nas 4L60E Shift Valve: kzbin.info/www/bejne/oIHLnmpsh6mtbLs

[@smiddy19801]

Im working on JF015E/RE0F11A just now and man i wish there was some videos as good as thses for it, the explanation ofg the hydraulic system is the best iv seen

[@SouthpawAutoworks]

Really appreciate the positive feedback.

[@joserodriguez2632]

Wonderful Presentation.....YOU JUST WON A NEW SUBSCRIBER...THANKS

[@SouthpawAutoworks]

Welcome aboard! The positive feedback is appreciated. Thanks for dropping me a line, Jose.

[@wayne007nz]

best explanation on youtube, makes it easier for a rookie like me to learn, thanks have hit subscribe.

[@SouthpawAutoworks]

Right on! Welcome aboard! Really appreciate the positive feedback. Thanks for dropping me a line.

[@juansprojects3056]

One of the more in depth videos I've seen. Definitely subscribing.

[@SouthpawAutoworks]

Right on! Thanks for dropping me a line!

[@AlysonHelmer-p5i]

This was a perfect video and incredibly helpful! Does the 1-2 shift solenoid also control the transmission shifting from 2nd gear into 3rd?

[@SouthpawAutoworks]

The 2-3 Shift Solenoid controls the 2-3 Shift Valve-train, which controls that upshift.

[@KeepitReal-wn4zj]

Great video, you should do a weekend Rebuild Transmission Seminar👍

[@BigZaddy2112]

What causes a hard shift into Reverse from PD321? Thanks! 2001 Chevy Astro AWD 4L60E

[@LimestoneCoastCustoms]

Awesome! I just tripped across this video (I'll make sure to watch more) I wish it had come up in my many searches on the 4L60e. I do have a question & while I get there are soooo many different possibilities as to the cause of my problem, some of which I have already dealt with by replacing sensors. I have a K1500 Suburban with a 4L60e that appears to shift fine in the mornings but come later in the day (only short drives to & from work) the trans shifts up very early & bogs down. In fact, if you put your foot on the gas it shifts up first & not pick up revs or even shift down. It will then shift down given a little time but then it will shift straight up again. Some history, when I put 33" tyres on a couple of years ago, it started throwing a trans code on the odd occasion & reacted the same, but if I cleared the code, it came good & it sometimes wouldn't happen again for a few weeks or months. I have since gone to 35" tyres but changed the diff to a 4:56 which is pretty close to stock gearing, if anything it's probably a little the other way as the tyres only measure 34 1/2" but its certainly improved off the line, around town & is great for off road. I have replaced the TPS & MAF in this hunt. Unfortunately I don't have the Tech 2 GM OBD unit yet so I can see what the % of the throttle is, but it's odd that it seems to shift fine in the mornings, if anything, it shifts GREAT with very positive shifts as I would expect from a trans that was built with a shift kit for towing a few years ago. I am a bit suspect on a vacuum leak as I sometimes can smell fuel but I'm unsure if there are any sensors ties to the trans that would effect it, especially as I mentioned, it seems fine in the mornings. It plays up when I come home for lunch as it does after work. very odd to me with the limited knowledge I have with transmissions. More recently when I back off the gas, the revs will drop very low. I have had a stuck IAC a couple of times & am about to order a new one. P.S. The Suburban is actually Australian Delivered as R/H Drive & as a Holden, so finding a proper Tech 2 for it is proving a challenge but as I do all my own mechanical (I rebuilt a 14 bolt rear diff for it last year with a locker) & she is being built as our camping rig, we intend to keep the old girl especially as they are not very common here in Oz. I appreciate any thoughts on what could be causing the problem. Cheers!! Rod. (sorry for the essay!)

[@SouthpawAutoworks]

You've got a lot going on here... I've read this comment of yours twice, trying to gather info. First and foremost, drivability (engine) problems can/will affect transmission performance. Always best to address all engine problems before chasing transmission problems. The PCM (4L60E computer) gathers info from a number of engine sensors, and it makes "decisions" based on the input received from those sensors. Tire Size: The PCM is constantly watching engine load (MAF, TPS, etc) and road speed (speed sensors). Changing the tire size can affect the speed sensor info that the PCM is receiving. Because of ABS (Anti-Locking Brake) systems, many vehicle are equipped with speed sensors at each wheel. I'm not sure if this is the case with your vehicle... Temperature: For emissions purposes, engineers have designed the vehicles to warm up as fast as possible. When the vehicle is cold, all up-shifts are delayed. The TCC (torque converter clutch) is typically inhibited. Doing these things raises the engine RPMS, which raises engine temp faster. However, as the engine warms up, the shifts will occur sooner. This may explain why your engine shifts normally when cold....and shifts too soon when the engine warms up. Once again, I'd start by addressing engine problems. If the problem still persists, I'd be leaning towards the tire size and differential mod. PCM might need to be re-programmed. Thank you for the positive feedback! PS - If it feels right to you, please help me spread the word about this channel. Here's an easy way to share... 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c 60-Second Preview of the video you just watched: kzbin.info/www/bejne/nIizhJSCmsaCjqs

[@LimestoneCoastCustoms]

@@SouthpawAutoworks Thanks for your reply. Yes, I have been sorting through the problems with the old girl & learning heaps as I go. I'm pretty much old school so learning all the sensors etc has been a challenge but I'm enjoying figuring out what makes it tick. Now that you have mentioned the ABS, I have also done a complete brake upgrade (disc conversion on the 14 bolt rear when I built it, upgraded discs & callipers on the front plus a bigger master cylinder to suit. I am yet to sort the ABS light as I need to cycle the ABS (another reason to purchase a Tech 2) then re-bleed the brakes, though it is pulling up ok at the moment. Yes, there is ABS sensors on the front only, I wonder if that is contributing to the trans problem?? Because of the diff ratio change to suit the larger tyres, I'm not sure that is actually the problem as the gearing is close to stock but of course I can't rule it out. As far as temp is concerned, I nearly always let my truck warm up in the mornings because of the short drive, but it's odd that after it sits until lunchtime, almost straight away the early shifting happens. I wonder if it can be ambient temperature ?? it's the same when I drive home after work, if anything, I think it is worse later in the day, if that's possible?? Yes, I'm happy to share your work, helping each other is what it's all about! CHEERS!

[@SouthpawAutoworks]

I also enjoy learning how stuff ticks. And there's always something to learn! When time permits, I'll be creating a video series that shows how engine problems (and other systems) can cause transmission problems. Can you pull all of the trouble codes? Note: If you recently reset trouble codes, drive it long enough (minutes, days, etc) to bring back all of the original codes.

[@LimestoneCoastCustoms]

@@SouthpawAutoworks No, no codes at the moment, which is why I need to get my hands on a Tech 2 for this vehicle so I can look at stuff like shift points, cycle the ABS etc. As you would know, a simple code reader just doesn't give enough info & can only clear the codes. Unfortunately I'm having trouble finding one in Australia as my truck was built for the Aust. market. The hunt is still on though.

[@SouthpawAutoworks]

Understood. Wishing you the best of luck with your hunt.

[@789hungry]

If I replace transmission fluid , is old fluid still inside the hydraulic pump body ? Is there a way or a hole for the old fluid flow out when transmission fluid change ? Please reply and thanks !!!

[@modquad18]

So glad I found your channel, the way you present this information is the best I’ve seen yet! I have a 2005 deep pan 4L60 w/145k that loses reverse and forward after warm up and a slight buzzing noise can be heard when the gears fail. Just dropped the pan and the filter looks to be clogged (I’m assuming oil starvation). Also noted the 1-2 solenoid is very loose in its bore, while the 3-4 is nice and snug. I plan to replace the 1-2 and filter, but wondering if the 1-2 and 3-4 are the same part? They look identical and a few parts sites seem to indicate that they are. Thanks again and happy to support you!

[@SouthpawAutoworks]

Regarding the filter, I've encountered this before. If there's enough clutch material settled in the bottom of the pan, after the engine/trans is fired up (and warmed up) that clutch material will start circulating through the fluid/trans, and plug the filter...yes, causing oil starvation. Cleaning the pan, and replacing the filter will take care of the issue....for now. The clutch material came from somewhere. In other words, something may be coming apart inside the trans. Just a heads up. The 1-2 valve-train is under load (a spring). The 2-3 valve-train has no spring. So, the 1-2 Shift Solenoid will be snug, and the 2-3 will wobble quite a bit...and this is normal. Both the shift solenoids are the exact same part. Glad you're enjoying the content. Really appreciate the positive feedback.

[@modquad18]

@@SouthpawAutoworks Thanks for the lightning fast reply! OK, so I had the solenoids reversed, 3-4 is on the passenger side when trans installed, so I’m probably good with not replacing those. And yes, I’d say more debris than normal in this pan and on magnet - not terrible for first service at 145k, but the vehicle (Silverado) will now serve as a farm truck and won’t see many miles going forward. Thanks again, spectacular production quality!

[@SouthpawAutoworks]

Right on. Thanks for being here.

[@modquad18]

New filter & fluid resolved the issue 👍🏽 2005 Silverado, 4.3L, 2WD Also, 1/2” threaded steel pipe works perfect to extract filter seal.

[@SouthpawAutoworks]

Right on! Congrats! Oh, cool. I'll have to give that method a go. Thanks for sharing.

[@brandonmarcinkiewicz613]

Love the videos. Just came across mine not wanting to shift into last at 50-55 Just more rpm not shifting No codes

[@SouthpawAutoworks]

Could be dealing with an AFL Valve that's wore out (actually the valve bore). Could also be a leaking bore plug for the 4-3 Sequence Valve. I would imagine that you'd have a code, though. If the PCM is commanding the trans to up-shift to 4th gear, the PCM will expect to see the engine RPM drop, after the shift. When it does not drop, the PCM may throw a code for incorrect gear ratio.

[@donnielong1692]

Great video! I just installed a atk rebuilt 4l60e in my 2007 silverado and 1st 3rd and 4th feel great however the 1-2 shift in light throttle sometimes i feel two bumps when it makes its shift. What could that be and could it be a part of the learning of the adapts?

[@TheKrighter]

And what does any of this have to do with changing gears within the transmission itself? Does this affect clutch packs and planetary gears, etc.? How?

[@SouthpawAutoworks]

The solenoids affect oil pressure, at the end of the valve. That pressure, or lack of pressure, results in valve movement. The valve acts as a doorway for a different oil pressure to go past/through/around the valve. The oil that moves past the valve is directed to a clutch piston. That oil pressure moves the piston and smashes (or applies) the clutch pack. That applied clutch directly affects the planetary gear set. Note: I mention clutch pack. This applies to the band, too. It will either: 1) Cause a portion of the gear set to rotate. 2). Prevent a portion of the gear set from rotating.

[@rustyrogerson7371]

I have 2003 4x4 4l6oe 1 and reverse .with scaner can get 4 . Im new to tranys preasure was good a and b solinoids replaced still same no major metal in pan just fines 200000 miles on rig .your videos are great thank you any sugestions for next step

[@Rufusthered186]

It's not until you watch a video like this that you actually get an appreciate of the genius that went into something we take for granted every day. Just coming up with the concept is one thing? Buy then actually engineere it, that's a whole new beast. Anyway I have a question for anyone who might be able to help? I'm running the 4L60e transmission and recently had work done to the motor. A full rebuild with a few modifications. A stage 2 cam. Performance headers into 2 & half" exhaust with high flow cats. As well as a cold air performance intake. Plus a few other tweaks. So now the shift points are out and other than dropping a manual gearbox in. And or fitting a stand alone transmission system? Is there a way it can adjust the shift points using a GM Tech 2 scan tool that is specifically set up for my model of car. It's the same one the dealership use when they go over it? And seeing that I've now modified the engine shouldn't have the PCM tuned /programmed to match the the newly modified engine? I was told that if I had the proper scan tool which I do. Can anyone give me a heads up on programming a PCM. Any help would be much appreciated.

[@henearkrip]

Amazing way to explain the basic! Awesome work!! Fully subscribed!!

[@SouthpawAutoworks]

Thanks, Alejandro! Welcome aboard!

[@henearkrip]

@@SouthpawAutoworks Thank you! Your explanation helps me a lot! I'm trying to make a test bench for automatic transmission from the electronic point of view and honestly have no idea of the basic to start the project. Thank you again!!

[@CORVAIRWILD]

From Delray Florida. I have a problem with a 700r4, 1990 4 wheel drive suburban, 350tbi. The transmission shifts perfectly, but it clunks violently into gear hot or cold, but not always. I change the accumulator valve in the auxiliary valve body, based on a transmission shops recommendation, and it still does it randomly. Otherwise shifts up and down perfectly. I drove it back from Florida to New York towing another junk Silverado. Just that bloody clunk. U joints are new, it's 100% the tranny

[@SouthpawAutoworks]

The "garage shift." When the vehicle is parked in the garage (could be parked anywhere) and the engine is fired up, and the trans is shifted out of Park and shifted into Reverse, or Drive. An accumulator came to my mind as well. But, let me think about this condition you're experiencing, and get back to you. Questions: 1). Do you have an automatic transmission pressure gauge? Note: A typical gas engine oil pressure gauge doesn't read high enough for automatics. Automatics need a gauge that'll read over 300 PSI....for safety reasons, among others. 2). With the trans in Park, and the engine idling, what is the pressure reading? PS - If it feels right to you, please help me spread the word about this channel. 1 Handed Transmission Rebuilder: (60-Sec Preview) kzbin.info/www/bejne/r2S5mquXlKqWZ6c

[@CORVAIRWILD]

@@SouthpawAutoworks ok, I'll buy a gauge. The $20 Amazon units have lousy ratings. I guess I'll have to spend? $40? $50? Recommendation? Thank you

[@SouthpawAutoworks]

I've personally had good luck with OTC products. Or at least products that have an OTC sticker on them. Who knows who makes anything anymore. =/ amzn.to/3NWZGiX DISCLOSURE: 🕵 As an Amazon Associate I earn from qualifying purchases. Some, if not all, of the links contained in this video description (or comment) are affiliate links. This means that, at no additional cost to you, I will receive a small commission on any purchases you make through the website links provided above.

[@maestrotyper]

Hello greetings from indonesia....would like to drop u a question... is measuring resistance of the solenoid valve (Mv1 2 and 3) a right way to decide whether or not to replace the valves?

[@ta61cnc]

What would delay a 4L60E going into 1st gear from a dead stop-particularly when using towing mode?

[@michaelbaskinmichael9862]

If you have a short or problem in electrical circuit that goes to transmission could this effect function of it working at all. Tcc regulator valve is stuck open

[@warrenmoore3006]

Beautiful explanation Southpaw ;;;; Crystal Clear & Simple - Thanx Guy 😊

[@SouthpawAutoworks]

My pleasure. Thanks for dropping me a line!

[@albertdejesus2848]

Saludos! Mi transmisión 5140e no aplica el "parking" se queda en neutral. Cuál es el solenoide de "parking"?

[@АлександрВолков-п2р5т]

Спасибо тебе Роберт за твой канал. Он помогает мне многое понять. Ты великолепный учитель! Thank you!

[@SouthpawAutoworks]

Положительный отзыв приветствуется. Спасибо.

[@timothyerin]

This is second time watching your awesome straight forward vid on solenoid 1,2 operation. I accidentally sjfted my 4l60E into Reverse doig 55 moh on thr freeway for a quick moment. I am missing 1, 2, overdrive gears. A scan revealedpoissible solenoid failure. I installed new ones to no avail. Im going to try to see if solenoid 1,2 is ghetting connrction., Suggestionbs please? thy Robert Tim.

[@sonnyleno6426]

I like how you go about it I can understand it kind of hard to keep up with the other guys on here is a 4l60 about the same as a 4l80 e

[@SouthpawAutoworks]

Glad it's helpful. 4L60E vs 4L80E: They're completely different transmissions. The 4L80E does utilizes shift solenoids and shift valves, that operate in a similar manner. However, the solenoids have a different "firing order" than the 4L60E.

[@sonnyleno6426]

@@SouthpawAutoworks I think you guys are doing a great job

[@sonnyleno6426]

Have you done a 4L80E series thank you guys are doing a great job it's helped me out a lot thank you

[@SouthpawAutoworks]

We have not done a 4L80E series, yet. However, we're currently working on a TH400 series. The 4L80E is essentially a TH400, with an Overdrive section added to it.

[@SouthpawAutoworks]

Thank you for the kind words.

[@heavensfugitive6447]

Awesome video! Great share. Thank you for helping me teach my boys! 🤙🏼🍻

[@SouthpawAutoworks]

Right on! You bet!

[@screamingflat6]

Thanks for the video! Best explain on youtube so far!

[@SouthpawAutoworks]

Right on! Thanks for dropping me a line.

[@JeremysCarRepair]

Hey man great video thank you! I’m having issue with my 4l60e. I have no second gear when the trans is cold, below roughly 100 degrees. After driving for about 5 minutes, everything operates normally. I’m stumped. Fluid level is ok.

[@rndfor]

maybe not enough oil presure when cold

[@YewoMwafulirwa-gt2wn]

Hy you have a new fan from Malaysia

[@SouthpawAutoworks]

Right on!

[@bradfriedman9398]

OK....Finally figured out the issue. Maybe this can help others with strange 4l60e problems on a 1997 C1500 Chevy. The problem is that the PCM commands the shift solenoid B OFF , but it's internal volt meter is stuck on reading 0V at the wire coming from the 2-3 shift valve , even though truly 12V appears at the B solenoid ground pin when the solenoid is commanded OFF. With its internal volt meter stuck on 0V for shift solenoid B, it never sets the fault in 1st or 2nd or from the 1 to 2 shift, because solenoid "B" is always commanded ON in 1st and 2nd. The PCM is happy because 0V is what you would measure with an ON solenoid. The fault only occurs when the shift solenoid is turned OFF , the vehicle correctly makes the 2-3 shift and then a few seconds later CEL comes on and truck is in limp home 3rd gear. Now I was able to understand why shift solenoid B would always say "short circuit to ground" in the data stream as soon at the vehicle would go into limp home 3rd. ( IN OFF state PCM must measure 12V on ground wire ) So at the end of the day, I believe the transmission PCM failed 1st which caused the vehicle to only have 3rd gear (and manual 2nd if you dropped it down) . The original owner I believe drove the truck a long time in this failsafe mode, shifting down to 2nd at stops and shifting up to 3rd when moving. ( He died, so I can't prove but very likely )Over time this eventually overheated and burned up the reverse input drum and 2/4 band, leaving no 2nd or 4th gear. After I rebuilt the tranny, the transmission is perfectly fine but I was back to square one , now with a perfectly good tranny and a BAD PCM permanently reading/measuring 0V ( ON ) for the B solenoid ground wire.

[@burgundy4583]

Tip of the hat 2 uu Legend , I deeply appreciate your time your sacrifice for tha better of us ❤

[@SouthpawAutoworks]

Appreciate you taking the time to drop me a line.

[@johnpro2847]

so..north south oil channels on the bottom...east west oil channels on the top..divided by a plate and gasket with small openings..similar to rail switching gear it would seem. nice explanation.,,thx

[@SouthpawAutoworks]

Yes, exactly. Thanks for dropping me a line.

[@hermanwallace8550]

My 2015 GMC Acadia has developed a (mild) 3-4 shift flare at W.O.T , or near wide open throttle. I feel it but can barely see it on the tachometer. It doesn't do it every time, but is becoming more consistent over time. Any ideas?

[@oregonwoodwizard]

Incredibly helpful explanation

[@SouthpawAutoworks]

Glad to hear that!

[@randolphleesandovalsn6517]

Man I rebuilt my trans about 4 years ago .I did it with KZbin step by step first time it runs I've been to ceader city Utah also LA and and Las Vegas New Mexico.By the way I live in Las Vegas Nevada, but now my transmission Isn't shifting right im thinking Maybe sticky v oil, dirty oil.Maybe sticky valve something got Stuck in side the valve body making it slip between gears also 3 n 4 did I do something wrong?

[@darreldotson8194]

the AFL valve when the solenoid is removed is not coming out, it seems stuck. The other valve from the other solenoid just snaps right out by the spring freely. This one doesnt. So i guess what im saying is how do I remove it and clean it up to get it to slide freely? It moves just a little back and forth. thanks man

[@darreldotson8194]

I'm sure it has to move freely like the other to work

[@kendallriebel3515]

So I have a 01 suburban that doesn’t shift out of 1st unless I lift throttle! And after lifting it seems to shit to 3rd but shifts to 4th and TC Lockup just fine. When I shift to 2nd manually it doesn’t shift, if go to 3rd manually it shifts as if in drive, once throttle is lifted. I was thinking it may of been shift solenoid but kinda doubting it after seeing this, what are your thoughts?

[@JaQuonCopeland]

Replace 1-2 solenoid and see what happens

[@MrSEANMOODY]

Rebuilt 4l60e initially no reverse, fixed reverse now nothing in any foward gear, I'm almost certain sprag is good, I did thorough inspection when I had it tore down, any ideas where I should look first

[@marvinmutshiya1742]

What happens if the transmission takes 3 minutes to move after engaging in drive, especially when cold,tried to change oil but still the same.

[@marcopolo-e7h]

My problem is that my car's transmission does not 'engage' when cold. Nothing happens with the shifter in 'drive' until a few minutes have passed, then if 'kicks-in' and the car moves. However, withe the engine/transmission at normal operating temperature the transmission behaves normally.

[@davonted93]

This was incredibly informative. I hope you enjoy every dollar of ad/youtube revenue 😂 question though, is ac delco a better replacement than genuine gm shift solenoid?

[@mickeycox6255]

Nice work 👏! Please give some knowledge on the tcm how it works and how to check if it's good or bad ..... thanks

[@SouthpawAutoworks]

Would love to cover that topic!.....when time permits. The positive feedback is appreciated. Thanks for dropping me a line!

[@ncascini01]

Nice job! Good illustrations!

[@SouthpawAutoworks]

Appreciate it!

[@nelsonreyes524]

Very nice for ur basic teacher from mechanic Pinoy thanks 🙏

[@SouthpawAutoworks]

My pleasure. Thanks for dropping me a line!

[@joshuaharvey5671]

Dude great video lol I was double checking removing a transmission for a rear main seal and came across your channel very insightful

[@SouthpawAutoworks]

Right on! Glad you found the channel.

[@keithwood1209]

great video, my head hurts with great Info Overload. I'm trying to understand my 2002 Acura TL transm shift problem. I lost power while driving on Hwy, I went to pass and lost acceleration power. RPM up - speed dropped. after engine cooled down I could drive enough to get off Hwy. Acura in driveway now ( towed home) I can drive around block & in 5 minutes trans Slipping. I've changed Trans fluid, What's next step ? should I change out solenoids Thanks in advance, Woody

[@joew8440]

Valve body’s and separator plates have always been like voodoo to me. I can’t imagine how someone invented that. But I’m glad they did.

[@SouthpawAutoworks]

It is crazy. Quite an imagination...

[@ginodioquino675]

hi sir, is it okay if i will cut the wire of TCC solenoid? If ever my tcc solenoid is frequently engaging?

[@darryncox6209]

Do the same thing apply to the 4l80e transmission???

[@paulforest1373]

My 94 chevy Silverado c1500 350 2wd slipping andwon't shift into 3rd gear. 1 & 2 gears work okay. What do you think ?

[@dblsecretprob6782]

96 Express van w/5.7L engine. Went on a long trip, 8 hrs, hot day. On the way home got caught in stop and go freeway traffic, after about 10 minutes, 1st gear would bang into 2nd, going to check fluid level today, no leaks, has approximately 84K miles. I read something about a TFF solenoid? Thanks in advance for your help, Greg

[@ctubeme]

I have a question or 2. First I have an 08' 4l60e that has a short to ground in the 3-2 downshift solenoid wiring . I have a scan tool that is capable of commanding 1-2 , 3-4 , tcc on/off , tcc enable/unenable, 3-2 solenoid and upshift 1-2-3-4 and 4-3-2-1 and it shows Me if the 1-2 sol is on/off and 3-4 on/off and tcc enable/unenable........ for each of the commanded states. Oh yes also pc . So when I start commanding 1-2 sol on it is in 3rd gear commanded until I command 1-2 sol on etc at which point it goes into 1st gear commanded and seems to command upshifts successfully 1-2-3-4 and 4-3-2-1. commanding the 3-2 on does not work it stays off. Driving vehicle upshifts1-2-3-4 normally and slowing down to turn or ? it downshifts normally. at 30 or 40 or 50 or ? it will not downswhift unless I manually pull it down. I replaced 3-2 sol for 30$ and the tcm for 80$. Before that I tried resetting the tcm unsuccessfully. I have been inspecting the wiring from the tcm and inside trans and where the sol control wiring enters/exits the trans for missing insulation but so far the wiring is in fairly good shape. At this point Im leaning towards the wiring as it makes its way up bell housing and across engine or the ecm for the short to ground. Vehicle is chevy express 1500 4.3l which Im sure You know creates ALOT of heat especially in Phoenix, AZ . Do You have an opinion as to the most likely location of the short to ground in the 3-2 circuit ? 1 more thing there is what looks like a diode in the rear bottom of the valve body that appears to have some damage/missing plastic/nylon that maybe is supposed to seal fluid out ? Maybe ? Thank You sincerely, Christopher Frost P.S. Sorry about the short book

[@fayezhendam6676]

Informative Video , thank you , pls I want oil flow schematic in pdf with explanation , if you have pls sent me

[@rhodyscott3288]

I put in a rebuilt 4l60e into my trailblazer 2004. It ran great for about 5days. I was on the freeway doin about 70 and the tranny kicked out of gear, like it was in neutral. I coasted off the freeway and got it to the house. I went through a lot of ideas why. My linkage, neutral safety switch, finally I ended up taking my tranny out and I found the bearing for the back of the tranny was blown out. I knew that in order to get to it I had to tear it completely down. In doing so I found the stater was shattered. That would explain the no pressure in the tranny. I replaced it and put it back together, now it is stuck in first gear. What you think?

[@jackiefuncheon1170]

Great video. My problem is going into 1st gear. My check engine light came on and my OD light started blinking. When I start out I can feel it clunk into gear. My code reads 07000 which gives me to many possibilities. No problem in any other gear. Any suggestions?

[@Dusty_Bottoms_]

Excellent presentation!

[@SouthpawAutoworks]

Thank you kindly!

[@nealjohnson8383]

I'm working on a 700 r4 4x4 its in a 89 Chevy pickup and the reverse