Diagnosing Lock-up Failure

[@JohnDoesItAll]

Awesome video! Thank you for sharing your knowledge and experience.

[@boostedbiker3878]

I purchased a 1993 c4 Corvette recently and the transmission was gone. I purchased a 4l60e from a 1996 c1500 a long with a micro controller from eBay to allow it to shift. No 1st or 4th gear (1st was intermittent for a short period) or lockup, that I'm aware of. I purchased solenoid A and B, hoping that helps the 1st and 4th issue. Im sure I damaged the pump on install. I made sure to seat the converter before installing but I believe it slipped on when trying to get into car. I purchased the transg-46 mod to modulate transmission pressure. Thanks for the videos, they are of great help.

[@PerformaBuiltTransmissions]

Your welcome!

[@Snailmailtrucker]

You're a Class act Ryan ! Liked/Subscribed

[@bunkster90]

Great vid ryan we alway enjoy upur knowledge. Here at our shop lately we've been seeing more misfires causeing transmission issues than anything else other than the great Ole sun shell stripping out

[@PerformaBuiltTransmissions]

I agree. Sadly i feel they usually still just think its the transmissions fault. Do the same thing to a 4l80 lol

[@joshuarivera7622]

Great video. Keep them rolling

[@papergatorzfedducca7998]

Can you do a video on how to convert from 4x4 to 2wd? 4l80e or 4l60e. From what I’ve seen it’s just changing the output shaft? I’m a beginner that never took a transmission apart, but I’ve bought some manuals to do so. And I have some transmissions to practice on.

[@PerformaBuiltTransmissions]

Thats really all there is to it. Usually takes someone experienced about 15 minutes to do

[@papergatorzfedducca7998]

@@PerformaBuiltTransmissions ok gotcha!!

[@MrDoctorchama]

Where do you have your shop in California ?? Thanks for the info

[@PerformaBuiltTransmissions]

My shop is in pennslyvania. Id never open one in Ca

[@jkstdstang]

Hey Ryan love all your videos you are very knowledgeable! Im Stumped with my 2001 silverado! about a minute after start up it wont move at all in gear. Turn the truck off and restart it and it will usually move again but only for about a minute then its just revving rpms. I have checked the harness voltage to the MAF and changed the MAF but no luck. Unplugged the 4l60e harness to put the trans in limp mode to get it home but still the same issue no gears after a minute or so. I have got a P1870. Should i drop the pan?

[@PerformaBuiltTransmissions]

Yes and check for a clogged filter.

[@nightwing_ese229]

Thanks for this video. It helped my understanding of how Torque converter lock-up works. I've got a 2000 jeep Cherokee with the AW4 and it stopped locking up, replaced the lockup solenoid and test drove it and it worked just fine. Next morning it stopped locking up completely and hasn't locked up since. I'm trying to diagnose this problem and I'm kind of stumped at the moment. Do you know what would cause this or where I should start looking to try and fix this? Thanks

[@PerformaBuiltTransmissions]

Codes? Check your brake switch as well.

[@nightwing_ese229]

@@PerformaBuiltTransmissions Current code its throwing is P0740, just this morning I was driving and it randomly shifted itself into neutral and would not go into anymore drive gears. It threw a P0715 code and all gears are just neutral. Before this it locked out twice for the first time in weeks but after the second time it locked out, this other issue started happening. I've been busy chasing this new code all day so I haven't been able to check the brake switch but I will as soon as I have can solve this other issue. Any input or suggestions for this other issue would be greatly appreciated as well.

[@PerformaBuiltTransmissions]

@@nightwing_ese229 input speed sensor in the transmission is bad ( can be tuned out with most pcm tcms ) or you have an open short condition with your vehicles computer. Older vehicle control modules are slowly old enough to lose internal grounds. Each plug has to have a jumper ground to fix it.

[@nightwing_ese229]

@@PerformaBuiltTransmissions That was my thought too but I tested the input speed sensor through the TCM connector prongs and it was reading 680 ohms which is between the recommended 500-700 range. I pulled it out today and have since ordered a new one and I will be putting it in as soon as it gets here but I'm not quite sure that its the issue. I also did just get a new torque converter and flex-plate put on by a shop, could this have to do with anything?

[@PerformaBuiltTransmissions]

If the stall speed for the converter is higher than stock it will cause this issue but if it matches im going more for iss. Imo find someone with hp tuners and change iss from fitted to not fitted in the checkbox menu. The sensor does not help your trans, only hurt it

[@MasterBlaster36914]

6L90E Does using the tow haul mode keep the torque converter from engaging ? Seems to keep the shudder from happening for the most part in my 2013 2500 HD. I just don't understand why no matter what a transmission does every shop says I need a whole new transmission ??? I'm thinking I'm going back to a truck made prior to 2008. Fuck the modern junk that seems to be made to be disposable anytime anything goes wrong.

[@PerformaBuiltTransmissions]

Yes and yes unfortunately the issue with the 6L series is major converter and trans pump issues by a terrible design. Your on borrowed time even using tow haul atm unfortunately.

[@MasterBlaster36914]

@@PerformaBuiltTransmissions I didn't have any problems with my transmission until I used a tuner. Then immediately after it started shuddering. Hypertech spectrum tuner. It screwed up immediately and I reset it to stock settings. Tried the tuner a couple of more times but, no change. I've also disconnected the battery and drained the system and done a relearn a couple of times.

[@PerformaBuiltTransmissions]

unfortunately those little handheld tuners have done more harm than good over the years and should be avoided at all costs. If your lucky you can take your vehicle to an actual tuner and have them reset everything and pray damage hasnt been done. But in my exp esp with handhelds like fitech, msd, tci, etc ... they all interfere with the actual data the pcm is sending and cause issues down the road every single time. They are nothing like a real tune.

[@MasterBlaster36914]

@PerformaBuiltTransmissions Thanks, I was going to take it to a dealership or something to try and re-tune it. Was just hoping that I wouldn't be throwing good money after bad. I haven't driven it hard and haven't smoked the fluid or anything.

[@Unknown-wc1hi]

what happens when it locks and stays locked. Trans wont release when put in gear, powers through the brakes. even with the exhaust brake engaged. still not enough to stop the truck. have to force it in to park to stop.

[@PerformaBuiltTransmissions]

Replace your tcc solenoid and or check your wiring and grounds

[@leoamaya1818]

I have a 94 impala SS & seems like I lost overdrive…I learned that not many can get live data nor a check engine light for my car. I learned it’s non PWM. The pcm controls it & if the fluid is clean, any advise would be appreciated.

[@PerformaBuiltTransmissions]

Change the TCC solenoid and start there

[@christophermorgan2840]

My c10 has your heavy hauler. Only a year old. Lockup is not engaging, or engaging randomly. I get rpm fluctuations over 60mph. Has an fti 3000 stall lock up, same age 2023. I’m in Maryland not too far from you guys. My tuner couldn’t figure it out and For now my he has lockup turned off. What should I do?

[@PerformaBuiltTransmissions]

If your tuner cant figure it out you need a different tuner for starters. You will need to call our tech support line and not youtube comments if you need assistance.

[@cloudrehzii]

I just bought a 07 Chevy 2500 with a 6l90 2wd . The guy parked the truck in the garage and the next morning it wouldn’t move. You can hear the transmission go intro gear and reverse but it’s locked up . Even in neutral it won’t move I had to remove the driveshaft just to get it to roll . Any idea I’m thinking the torque converter or the output ring gear but I’m no expert with transmissions .

[@PerformaBuiltTransmissions]

Do the basics. Pull codes and drop the pan to inspect.

[@KollynJ]

I have this same thing!!! What is it? Seems mechanical, I did have a bad brake bad but I almost couldn’t move it with a 250

[@KollynJ]

@@PerformaBuiltTransmissionsbinding driveshaft, bad output bearing?

[@cloudrehzii]

@@KollynJ my problem specifically was the parking rod inside the transmission. The tip came off and the spring was over extending making it stay in park in all gears .

[@ZacharyMaynard-ff7ge]

Great video thank you! I’m having issues with a 2017 ram 2500 with 68rfe. I’ve scoured the internet far and wide to figure out its problem. Only when I drive up steep hills (I live with steep hills everywhere) it will lock in and out of 2nd gear and 3rd gear (I have a monitor so I can see when gears lock) and I will have a loss of power. I get gear ratio codes for 2nd and 3rd but I also get a code “lost communication with Reductant Control Module”. The truck is also tuned. From my research so far I’m thinking torque converter, clutch solenoid pack, worn under drive clutches, or a bad tune. Is there any way to narrow down the culprit without changing out part by part? Any insight would be greatly appreciated, thanks!

[@PerformaBuiltTransmissions]

Well for starters you shouldnt be locking it up in 2nd or 3rd going up a hill. And if your using a monitor/ tuner thats handheld like tci, msd,fitech, or other small ob2 plug in then get rid of it. Next step would be to check your fluid appearance and smell. It probably needs rebuilt at this point. I suggest just driving the vehicle with a stock tune, lockup in 4th only after its repaired

[@ZacharyMaynard-ff7ge]

@@PerformaBuiltTransmissions I did a trans fluid service replacing the filters. The fluid was ever so slightly discolored and did smell off. There were some metal shavings in the pan but no large flakes. It’s an edge monitor cts3 insight. Should I start by stock tuning it or just go for a rebuild/ new transmission and then tune?

[@PerformaBuiltTransmissions]

If it smells its damaged. Start over with a rebuild, then tune, and set lockup parameters correctly in 3rd and 4th only.

[@lsswapped80]

What should I be looking for on a 2004 4l60e that when tcc is commanded, instead of rpm drop, it rises like it downshifted? It seems like a fluid leak somewhere in the tcc process. All gears work fine, shifts fine too. Thanks.

[@PerformaBuiltTransmissions]

any codes like p1870? The tcc works by grounding itself to activate and the black and tan wire on the vehicle harness can be used to force ground to determine a trans/ converter issue or electrical issue.

[@lsswapped80]

@@PerformaBuiltTransmissions running Holley terminator Xmax so really can’t pull codes. I appreciate the response.

[@ernestoalfaro1923]

hey ryan I have a 4l60e so everything shifts fine and smooth still feels new but when im in forth gear and tcc lock up i give it 25-30 percent gas and the rpm goes up and down like 100 rpm then pulls fine only does it when i cruise then give it gas it does it at any speed and rpm 60-70-80-90-100 mph i dont think its anything with the clutches tcc is always commanded on i dont think 4th gear is slipping can it be tcc solenoid or bad torque converter? what do u think it can be

[@PerformaBuiltTransmissions]

Is your trans built? Or stock

[@ernestoalfaro1923]

@ I just lost second 🥲

[@ernestoalfaro1923]

@ could that be bad pump seal? Cause the band to slip and burn up cause it would shift into 2nd but if I floored it it would slip until it burned up

[@ernestoalfaro1923]

@ I still have 1st and 3rd they feel pretty strong

[@PerformaBuiltTransmissions]

is the fluid dark and does it smell burnt

[@hollywd269]

Good video I have a 04 silverado 2500hd with the 4L80 in it shifts fine but will lock up at highway speeds but a mile or two at those speeds it unlocks and will not go back to lock up. If I have my code reader it never showed any code but if I do a reset erase codes it'll lock the converter back up. Just wondering if it could be that solenoid you mentioned. I have no code at all on the engine or trans. Thanks for any info you could or will help with.

[@PerformaBuiltTransmissions]

Make sure you dont have any misfires registering at speed with software as well. Most common issue with lockup at speed.

[@hollywd269]

@PerformaBuiltTransmissions ok thanks I've been chasing this for a few years now. But it's not a vehicle I use everyday so I guess I overlook it at times... but thanks for the info.

[@PerformaBuiltTransmissions]

02 sensors affect lockup as well. Check brake switch also. Just some extra things to look at

[@hollywd269]

Will do thanks. I had 02 sensors replaced and no misfire codes so far. It locks up then when you get about 70mph it'll unlock. Of I have a scan tool hooked up even though it doesn't throw any codes by check engine light it'll still let me erase code by scan tool and it'll lock back up but usually within a mile or so it'll unlock again.. thanks for all your help I'll keep diagnosing lol

[@PerformaBuiltTransmissions]

This may be as simple as adjusting the lockup values for speed and rpm. You may not have a real issue. Otherwise if your 4L80E still has the stock steel pwm tcc valve, then it may be leaking and a sonnax one should remedy that.

[@deerslayer5863]

Was there bad bonding in the street brawler series converter couple years ago just curious

[@PerformaBuiltTransmissions]

Yes there was

[@pbjladd]

have you ever heard of bigger tires and or gearing to be causing a lockup problem

[@PerformaBuiltTransmissions]

Yes absolutely. Changing tire size and rear ratios will affect lockup parameters

[@pbjladd]

thats what my mechanic says. should he do something else before he starts with the gear change, im guessing a checking the atf and filter and solenoid thank you very much @@PerformaBuiltTransmissions

[@PerformaBuiltTransmissions]

You could retune the correct ratio and shift points in hp tuners or change the rear and tires.

[@pbjladd]

@@PerformaBuiltTransmissions unfortunately what i have is a flashpaq so i cant do shift points but im running in tow mode which helps sweet spot is 71/73 it dont lock as much