6L80E Rebuild Tips

In this video, i go a few things i do on every rebuild for a 6L80E. Off to the shop again today, super busy. Thanks for watching.

[@checkingthetoob]

That's for all your help bud! The comment section especially!! Never seen anyone so helpful on KZbin. 👍and subscribed

[@GaryFerraro]

Thank you

[@hiesterconst]

Great video as always, Thank you for the great information and your professionalism!!! You truly are a master of your trade.

[@GaryFerraro]

Thanks Bob, thanks for watching

[@martincaldera386]

Saludos amigo Gary. Mis 2 Cutlass trabajando excelentemente bién (3T40, modelos 94 y 88) . Gracias por tus valiosos consejos.

[@GaryFerraro]

Thank you my friend

[@danmcmahon1656]

Gary - would you agree that the converter issues on these is not just the under-engineered converter itself, but also the TCC lockup strategy having lockup from 2nd all the way up? Way too much stress on the converter. You're probably aware of a colleague of yours who goes into the software and disables lockup on, I think, 2nd and 3rd. He does some other things too.

[@GaryFerraro]

yes, Blown converter is the #1 problem

[@danmcmahon1656]

@@GaryFerraro That's the easy part. The harder part, as some builders are tackling, is WHY. One builder with high visibility on uTube does not sell a 6L80 rebuild without addressing the root problem, which is the bad TCC lockup strategy.

[@GaryFerraro]

@@danmcmahon1656 a lot of people do tuners to correct that ive heard

[@darrenhattingh7334]

Fantastic information. Can you please list off what parts and part numbers you used? I’d appreciate it sir!

[@GaryFerraro]

To update the trans like i did in the video?

[@Almeshtages3]

Great work

[@GaryFerraro]

Thank you

[@eloyonate6203]

So i never had a problem with my trucks transmission since i bought it but yesterday i was hauling a trailer and my rpm went up and down on there own and then the rpms stayed at 5000 with me going no were.i pulled over and checked the fluid it looked dark and a tad bit low but no burnt smell..i threw a quart in it and drove it for 5 mins and then a check engine light turned on reading p0700..so i went to the auto parts store and took the old oil out and filter and put both new.i drove the truck for a few mins but its still doing the same thing...and now its also has a new code p0796 sayn the pcs solenoid is stuck off and after driving the truck the transmission oil got hot and smells burnt now it stayed T 5000 rpm and i was only going 45 50 miles per hour...so i took everything apart again..i did have very small metallic shavings on the magnet but no chunks..do you think its the TEHCM.. Or do you think i should replace the transmission

[@victorrodriguez8917]

Hi ., great videos ., question., does a 2015 yukon valve body will be identical to the one u just rebuild? If no ., would be able to rebuild one ?

[@johncueva3260]

I see that u changed the pressure regulator valve & M plugs but you did not mention what the causes are when they are bad

[@GaryFerraro]

When the regulator valve is worn, trans will slip even on pull away, all gears will be bad. The end plugs may get flared or erratic shifting

[@AhmedMohamed-hk3io]

No DTC , fluid is perfect and cherry red

[@GaryFerraro]

ok, have you checked line pressure?

[@ianm432]

Great stuff. I just purchased a complete drivetrain from an escalade L92 6.2 and 6l80e for a project. I need to change the output from 4wd to 2wd which as far as I can tell requires a full disassembly. It has 138,000 miles and drove excellent before it came out. I've watched every 6l80/6l90 video I can find on youtube. It will be my first auto trans rebuild but I'm pretty meticulous. I'm thinking about the Sonnax zip kit, billet aluminum 1-4 piston, HD 4-5-6 apply Piston kit, line pressure kit, and hd pump slide spring. Any thoughts or input?

[@GaryFerraro]

Trans does have to come apart to change out the output shaft, pump is part of the bellhousing, make sure it's nice and smooth, i always used the o-ring end plug kit by sonnax. Makesure the pressure switches are in good shape

[@lazybutton2428]

​@@GaryFerraro Hi Can you rebuild my transmission 6L -80 if I send it to you please

[@GaryFerraro]

@@lazybutton2428 Where are you located?

[@GaryFerraro]

@@lazybutton2428 Where are you located?

[@BoomerSooner405]

I rebuilt the pressure switches on my tehcm because the plastic pieces were all broken. It shifts better but is still shifting harder than usual on the first shift. Am I supposed to do any reprogramming after the pressure switch rebuild?

[@chipjumper]

Nathan Brown Do you have access to a Tech II scanner or Solus? You can initiate a relearn after getting the trans up to 150 (or was it 165 degrees F?). There is a KZbin video on this somewhere.

[@freaknleak69]

Hp Tuners will also initiate the relearn. 165F is the minimum temp to start it.

[@josevaldoduartevidal1736]

Essas peças ou orings com defeito , faz patinar ?

[@theopinion9452]

I wonder if I could replace the 4L60e behind the 5.7 in my 1997 chevy express with a 6L80e?

[@jwill9877]

Why would you want to downgrade

[@theopinion9452]

@@jwill9877 2 more gears in the 6L80,good for highway driving

[@jwill9877]

@@theopinion9452 terrible for reliability

[@jodypearman8526]

Gary, appreciate the the video, very helpful. I rebuilt my 6L80 in November, it all worked great and still does except for one thing. After it gets hot and you stop at a stop sign, when you let off the break it won’t roll, it seems as though it’s in neutral. if you wait it will go back in gear, if you give it a little gas it will jump in gear. It doesn’t do it all the time. I assumed it was the torque converter due to the symptoms, I changed it this week but it still does it. What do you think it is? It will do it in revers sometimes also.

[@GaryFerraro]

ok, sure fluid is full? is this producing any codes? You may want to overfill it a little to make sure it's not a fluid problem

[@jodypearman8526]

I did notice it was a little low after changing the converter, it is a little below the line now. I’ll over fill it and let you know. Thanks

[@GaryFerraro]

@@jodypearman8526 ok, that will be a good test to see if the problem goes away, let me know

[@jodypearman8526]

Gary Ferraro well I overfilled it and after it gets hot it does it. It isn’t giving any codes. Any ideas?

[@GaryFerraro]

ok, is reverse ok?

[@thomasjohnson1142]

You said you block sanded the valve body what grit did you use ?

[@pablomoreno7474]

Gary that end plug kit could fix look up codes?

[@GaryFerraro]

May not, the converters on these units have a lot of issues. End plug issues may set solenoid performance codes

[@jessiesgameplace6160]

Question , what torque converter do you put back in , some of these fail with low miles

[@GaryFerraro]

Jessie’s Gameplace I always put a rebuilt or have the original rebuilt.

[@Defender-Guy]

Is there an upgrade to the check balls? I’ve seen several different styles/colours and I know some transmissions used meta over nylon. Thoughts?

[@GaryFerraro]

Yes, there is an update, comes in the overhaul kits, torlon check balls, kinda like hard plastic

[@Defender-Guy]

@@GaryFerraro Thanks for the speedy response! Putting the 6L80e behind an LC9 5.3 that’s going in a Land Rover Defender 90 that’s going to St. Thomas, USVI, so very steep hills & low speeds. What upgrades to the transmission do you recommend?

[@ehchlo]

I have a quick question if you don’t mind? What is the ideal operating temperature of these 6l80 trans? My truck has a “thermostat” that wants to keep the fluid above *180/*190. Why is that? Should I bypass it with the sure cool kit from global transmissions? I always thought cooler was better? Please advise. Thank you for your time.

[@GaryFerraro]

180-190 is not bad, anything above 230 to me is getting to hot

[@ehchlo]

Gary Ferraro given a choice, would you run your own personal trans at 140, or 200?

[@GaryFerraro]

@@ehchlo 140 is cool for a trans, around 200 is more normal, i would want the temp around 200

[@checkingthetoob]

Is there a difference between 6L80 and a 6L80 e?

[@GaryFerraro]

No some people may not say the E

[@rogermorgan7983]

Hi Gary! quick question! 2011 Chevy Silverado, when slowing down the transmission has a hard downshift from 2nd to 1st. i already replaced the valvebody with a Sonnax rebuilt valve body and the problem still remains. any suggestions?

[@GaryFerraro]

can you tell me if any codes are present for the transmission, trans has it own tcm so that would need to be scanned, also any engine codes?

[@rogermorgan7983]

@@GaryFerraro the code that we had before was P0751. BUT THAT CODE WENT AWAY SINCE WE CHANGED THE VALVEBODY BUT THE VEHICLE DOING THE SAME THING

[@GaryFerraro]

@@rogermorgan7983 Have you tried doing a fast learn or reseting adapts?

[@mikeadams8470]

What’s the issue i need to address with a P0777 code?

[@GaryFerraro]

what is the definition of that code

[@jamest.5001]

What signals are needed from the ecm to the tcm in these transmissions?

[@gilbertozarate7283]

Pwm

[@royalmazagan3309]

I don't know how to thank you for this videos really big hate boss So i had a problem in my 2008 cts4 switch pressure i did replace the small plastic in the TEHCM i replace the filtre and when i finish my car doesn't want to start i recognize that the problem come from the starter so i jump it from the relay and finally the car start but now the car doesn't move in reverse no neutral in the cluster shows just Drive in all tge position and just goes forward it shift perfectly no more problem with the pressure i can't find whats exactly please sir if you can help me with that issue i'm not a professionnelle thanks so much

[@GaryFerraro]

sounds like you may have not hooked up the manual valve

[@royalmazagan3309]

Could you show me whats exactly pleaaase i know that something internal that i forget to do properly could you help me to know whats exactly [e-mail] thanks

[@GaryFerraro]

@@royalmazagan3309 I don't have any pictures of the manual valve but drop the pan and look for the "clicker" should be on the left side thats were the manual valve is, has to hook up to the tab sticking out of the internal linkage

[@royalmazagan3309]

Thank you so much really nice from you Sir

[@GaryFerraro]

@@royalmazagan3309 No Problem, if you need, my e-mail is [e-mail]

[@AhmedMohamed-hk3io]

Hello Mr. Ferraro , so I had 6l80e with 1-2 harsh shifting at low speed only is it related to line pressure valve or the end plugs need to be upgraded for sonnax or transgo with the oil seal . Thanks

[@GaryFerraro]

are there any codes present?

[@AhmedMohamed-hk3io]

@@GaryFerraro no sir

[@GaryFerraro]

@@AhmedMohamed-hk3io may want to confirm how line pressure is, if ok, may have a stuck compensator feed reg valve in the lower section of the valvebody

[@AhmedMohamed-hk3io]

@@GaryFerraro thank you so much Sir I am going to measure the pressure following by disassembling the valve body and see

[@rinky05]

Can you provide the part numbers of the sonnax & transgo parts that you use to upgrade?

[@GaryFerraro]

I upgrade the valvebody with the sonnax end plug kit, i will look that up and post back later, i do not use anything from Transgo on the 6L80E

[@GaryFerraro]

o-ring end plug kit, 104740-23 Pressure switch rebuild kit or if you need the tooling you will need the master kit Rebuild kit124740-30K Master rebuild kit124740-28K. I'm sorry I do use the transgo Pressure regulator drop in valve part # 6L8-VL-PR3

[@rinky05]

@@GaryFerraro Thanks so much Gary!! I swore I hear you say Transgo in the beginning of this vid, will have to look back.

[@GaryFerraro]

@@rinky05 I probably did, i use the pressure reg valves, it's a great product

[@hamnchee]

Is it OK to use mobile 1 synthetic trans fluid in the 6l80? 2012 Suburban 4 wheel drive.

[@GaryFerraro]

yes

[@hamnchee]

@@GaryFerraro Thanks! I was concerned, just got it rebuilt and they told me they used that instead of Dexron VI.

[@MD-cd7em]

Gary..For the 1234 3-5 Reverse housing...it shows an o-ring for the reverse piston and 1 for the balance piston...but..I do not see where the first one(reverse piston) goes..can you share insight for me?... I dont even remember it coming out of my old one..

[@MD-cd7em]

The clutch piston housing snap ring..

[@GaryFerraro]

@@MD-cd7em There are o-rings on the drum itself, did you see those

[@MD-cd7em]

@@GaryFerraro zyes I believe I have them in the right slots.. Do I have to compress that piston to expose the snap ring slot?

[@MD-cd7em]

@@GaryFerraro It may be a stupid question...but...the book didnt say ...and I'm no expert...bare with me brother..lol

[@GaryFerraro]

@@MD-cd7em yes

[@kalani1987]

A bit late but a question for you. I have a 09 Pontiac G8 w the 6l80. Trans shifts hard from Park, has a 2 second delay to Drive, and has a kick to 2nd gear, then some slipping. Drives fine on the highway, trouble only when city driving. Did 1st trans change at 90k miles, fluid was clean no apparent shavings. Did 2 more fluid changes and am at 115k miles. No check engine light. I have had this problem since the first fluid change. What could be my issue? Thanks

[@GaryFerraro]

Sure this is full? check the fluid when car is hot, Look at both sides of the stick, if one side reads lower that is the true reading, always go with the lower side

[@harrycanty2929]

How can I go contacting you, have ?'s about my 42RLE transmission. Driving at 40mp it starts shudder, an it goes away over that. Can it be my transmission? It has 150,00 miles.

[@GaryFerraro]

Sounds like when converter is commanded on, the torque converter clutch is chattering, how long is it doing this for?

[@harrycanty2929]

It has been doing this for about a year. Sir. thank you very much for getting back with me, Is there anything you can recommend.

[@harrycanty2929]

When around 40ish mph it feels like running over a rumble strip on side of a freeway, once pass 40 mph it go away. if I have OD off it don't seem to do it.

[@GaryFerraro]

@@harrycanty2929 With what your saying, that is a converter chatter for sure

[@GaryFerraro]

@@harrycanty2929 A trans service probably won't work, not much can be done on the outside other than pulling the trans

[@Defender-Guy]

What’s the blue goop you’re using?

[@GaryFerraro]

Trans Gel, good stuff, when the trans heats up it melts

[@Defender-Guy]

@@GaryFerraro Got some, thanks Gary!

[@GaryFerraro]

@@Defender-Guy Welcome

[@pathutson5227]

Question man, ive got my valve body tore down and im trying to replace the valves in the valve body. I am having trouble getting the tcc valve out. Do you have any advice to get this thing out?

[@GaryFerraro]

Why taking valves out, did trans have metal, valves stuck, have to check a diagram of the TCC valve, have one at the shop

[@pathutson5227]

@@GaryFerraro had code p0741 ordered the sonnax zip kit. Comes with new tcc valve. The old one moved about 1/4 inch give or take and that was it. I'm afraid I messed up the valve body trying to get it out. Thought maybe it had turned in the slot. Tried to get it to turn and just ate into the valve.. There was some metal dust in the pan. Little bit of actual flakes that you could tell were metal by feel. Replacing the torque converter, flex plate, rebuilding valve body and replacing filter. I had a line blow off the radiator a few weeks back lost 3/4s of the fluid.

[@pathutson5227]

@@GaryFerraro fluid also very dark, and burnt.

[@GaryFerraro]

@@pathutson5227 Did any of the valves come out, try getting out one piece at a time, or use a scribe with a 90 degree angle to try to push out valves

[@pathutson5227]

@@GaryFerraro yes I got the clutch valves out and the one next to the tcc valve. The just slid right out pretty much. I used a 90° a 45° and even tried a flat head to no avail on the tcc valve. Only one that gave me any problems.

[@chipjumper]

What does a 6L80 rebuild like this cost?

[@GaryFerraro]

full rebuild with a tehcm, around 3200

[@chipjumper]

Gary Ferraro why so pricey versus a 4L60? I know a couple local shops that’ll do a 4L60 for $500-700 if I bring them the unit.

[@GaryFerraro]

@@chipjumper Every one of my rebuilds gets a computer, parts are more expensive being it's a 6 speed and thats with me doing the whole job from start to finish including the install

[@spinn71]

Please tell me you can help me. I've lost one of the 4 10mm head bolts that bolts the rim to the valve body. Mine seems to be a M6 head but the shaft is .8 or M5. Dealer doesn't even ha e a part number for that. Where can I get it?

[@spinn71]

I meant to say Tcm module

[@GaryFerraro]

@@spinn71 Do you need any other parts? where are you located?

[@spinn71]

@@GaryFerraro I'm in Los Angeles. I just need that 1 bolt. Are you familiar with that weird bolt?

[@spinn71]

I can only find an M5x.8x55 which is the right thread size, but the one I need is a 10mm socket head with a .8 thread pitch

[@GaryFerraro]

@@spinn71 I was going to say to get the thread size and just pick up another bolt somewhere, i buy parts from transtar but i don't think they would have the bolt either

[@darylmclain5181]

I have the 6l80e transmission I'm rebuild valve body do you have the part number for the hole kit

[@GaryFerraro]

Do you mean the end plug kit for the valvebody or the overhaul kit? or shift kit?

[@darylmclain5181]

Overhaul kit

[@darylmclain5181]

The problem I have reverse the suburban moves forward alittle like 1 mph I drop pan no shavings in pan looks clean hoping it was valve body

[@GaryFerraro]

@@darylmclain5181 ok, so reverse is ok but forward is the problem correct? what year is the car? does it sometimes not move forward? any codes?

[@darylmclain5181]

2010 Chevy suburban 1500 LT 4 wheel drive

[@MrBody-jd3vb]

Just did a rebuild on 6l80 ,new tecom,but first gear and reverse jump in and out once you stop to go in gear,mash gas go in gear ,PLEASE HELP

[@GaryFerraro]

Did you check the pressure regulator valve?

[@MrBody-jd3vb]

@@GaryFerraro no sir I'm open for all options a mechanic done the work I watched ,,9105497916 Charles or email [e-mail],,,HE REBUILT TRANSMISSION WITH NEW KIT I THEN HAD TO BUY A CONVERTER THEN A TCM NOW IM STUCK

[@GaryFerraro]

@@MrBody-jd3vb ok, tcm was programmed correct? does the mechanic have a pressure gauge? any different from when the car is cold or hot?

[@MrBody-jd3vb]

@@GaryFerraro yes Cadillac dealership program it

[@MrBody-jd3vb]

I'm not sure if he have one but I will reach out to see if he got one and you thinks its PRESSURE REGULATOR WHATS GIVING ME THIS PROBLEM

[@MD-cd7em]

Gary...Can you tell me which way do the tabs point when installing the.low/ reverse clutch " bellville " return sprint?

[@GaryFerraro]

The fingers face up

[@MD-cd7em]

@@GaryFerraro THANKYOU GARY..Thenook skipped that step..I forgot

[@GaryFerraro]

@@MD-cd7em No Problem, anytime

[@MD-cd7em]

@@GaryFerraro Just wanted to let you know I got the trans running....Thankyou Sir...it seems to be running Great..

[@GaryFerraro]

@@MD-cd7em Great! Thanks for the update

[@MD-cd7em]

YES SIRR..THANKYOU

[@GaryFerraro]

Thanks for watching

[@GaryFerraro]

Levente, Your post did not show, you can e-mail me at [e-mail]

[@wzrd__3262]

I’m having an issue with my 2008 bmw 335i E92 from what I’ve researched online my car has the 6hp26 the car has a hard shift going from 2 to 3 but now I have another problem the transmission is slipping my rpm will rise but will not accelerate and will throw a “transmission fault” code and it is struggling to move as if the clutch was out like in a manual (I have an automatic I’m just comparing) I have a new pan and filter new sealing sleeve plug along with the rectangular plastic plug and the 4 sealing sleeves that are under the valve body as well but could it be the valve body solenoids? Not everything else? regardless I’m still going to be doing all this but would new solenoids most likely be my issue so I can go ahead and get new ones as well? or could the symptoms be of something completely different? Also have not scanned for codes If you need more details I could possibly provide more thanks you!!!

[@wzrd__3262]

Rpm slippage also occurred in 5 while accelerating

[@GaryFerraro]

@@wzrd__3262 OK, would like to know if cods are present. Also, does the car seem to drive ok when cold? and slips when hot

[@wzrd__3262]

Gary Ferraro I have a “Cobb access port” for tunning purposes and does read codes but I don’t believe that it reads transmission codes, but when ever it would throw the transmission fault code on my display was when it would slip and reach or be close to redline and would only keep me in one gear and I would use my access port to clear the code and the transmission would run normally again with the hard shift and occasionally slip but it has gotten worst and now will slipping in 1st with little to no move meant unless I’m super gentle on the gas so it grabs And what is a good tool to check for trans codes?

[@wzrd__3262]

Gary Ferraro and when cold it would occasionally not shift as hard as when hot but for the most part still drive similarly

[@wzrd__3262]

Gary Ferraro and hard shift are not as present in “D” mode as they are in auto manual, but still slip when accelerating