6L80 overhaul 

I just finished my first attempt at a 6l80 rebuild and it was successful thanks to this video thank you very much

Any guy that does not use a battery-operated drill to remove and replace bolts is the guy I want working on my stuff. Getting it done right is more important than getting it done quickly.

This was the most educational video I've ever seen

Geez I'd pay to see you and Richard from precision transmissions get together...both of you are so good to watch at your trade...love it...greetings from Australia.

the amount of complexity to a vehicle is mind boggling

Just rebuilt one of these in the parking lot of the rv park. Fairly decent. Nothing like most other transmissions ive messed with. Just so easy to put this together.

Thank you for the videos. I've downloaded this one and your video on the electrical and hydraulics for this transmission, and it is because of videos like yours that somebody like me is able to repair my own transmission, engines, and pretty much do all the things that other people pay thousands of dollars to have done for them.

I think its great to stumble across someone who still works with natural pride and applies proper procedure when performing a skill. It restores my faith that some future techs are getting the right knowledge and also the correct way of applying the skills they are in the process of mastering. I will definitely let some of my younger gear head associates to invest their spare time into tuning you in.

Thanks for the video! Awesome detailed explanation of how the internal components work together. Appreciate the tips on options where special tools are needed to get the specific task done. Rebuilding my 6L80 in a 2014 Silverado, failed torque converter at 120k miles. Preferred to have my reputable local shop do the repair but their backlog was ~6 weeks to get it in. Videos like yours and an ATSG manual allowed me to tackle the project myself.

This is the best educational video that I have seen so far. He breaks each section down and I like the fact, that he doesn't pop out all the spacers out when he pulls out each device.

The automotive school I graduated from in 1973. It is one of the best, if not the best, automotive school in the country. Most manufacturers hire graduates from this school because it is that good. (yes I am biased!)

Pvc pipe, cut in half long ways. Then, assemble both halves around the ring and squeeze. Rotate the halves in different positions while squeezing. Then, finish sizing with whatever components the rings seal.

Most informative video of the 6l80 anywhere on the internet, very impressive, keep up the exceptional work sir!

This was a useful video for me. Thank you for taking the time and sharing your knowledge. I am a master tech and have been working in professional shops for over 30’ years now. I have been able to tear down, diagnose (more or lees at times) and successfully reassemble/return to service several different units including now one of these. I still long to understand how it all works and what is actually going on during the different gear ranging. I would enjoy learning if I could find a class to attend and would gladly pay to attend a quality class. Thanks again! The explanation of the power flow was inspiring!

Thank you for for these detailed walk through. Extremely helpful. Just did a low reverse sprag replacement, new clutches & steels, sonnax zip kit, sonnax line pressure booster, sonnax billet 1234 piston, and sonnax 456 apply piston on my turbo 5.3 12' sierra.

Idk how you don’t have more subscribers. I learned a lot from this vid!

Just getting on the bench and learning the 6L80 built two so far no problems going back over your videos because this last one go forward in reverse lol taking it back apart Monday seeing what I can find. Thank you for making these very informational.

Good video, I may use this video one day if I have issues with mine!

Great very informative and educational video. I had a pleasure to watch and listen to You. Thanks a lot.

Thank you. You're such a knowledgeable person. Excellently made video. I just did my 6l80 with a billet tq & output shaft its built

Keep up the good work, guys like you make RU-vid amazing. The in-depth video and knowledge is amazing. You sir are helping to make people’s lives easier.

Thank you for this video, My 6L90 appreciates it!

This a a fantastic video. I have spent a LOT of time watching transmissions be rebuilt. You do a great job presenting information and educating

Greetings from the University of California! Amazing videos and information you have here! The planning and time involved are very evident to say the least...definitely a top notch presentation. I do a bit of automotive transmission work as a hobby and side gig so this info has been very helpful!

Thank you much for sharing this! I have never been in an ATX, only have messed with MTX units. I have a 2014 Silverado with the 6L80, it runs fine with no issues... I do have about 350k km on the clock though! I just like to have contingency plans and preempative learning, as nothing lasts forever and looking at 350k km... I would rather just rebuild before failure. The good thing is with the long time span this unit was used, spares are likely going to be avail for some time... But it is good to get an overview of some things that may be more prone to wear and failure. Looks like a bell housing and pump cover would be a good thing to have as original spares. I don't have a machine shop, but the price of them new isn't really too bad. My goal eventually is to have a donor truck, so I can rebuild and upgrade the engine and ATX from it ahead of time, without having my truck sitting inop in my shop. Then when my truck actually starts exhibiting issues, I can swap the rebuilt units in, and then be able to rebuild the worn and have as a backup spare. It certainly looks like rebuilding the 6L80 in one's garage is doable, with some investments or fab of tools. Thanks again!

Great video who is need repair gm transmission. All is clear 👍

I will be using this video to rebuild my 2014 Chevy Silverado 5.3

Very detailed video thank you very much for the time

sorry I was in a hit-and-run accident 3yrs ago I'm having and hard time through it. and it's no fun. sorry . Jay the Florida pool pump motor bearing repair guy When Service Calls Longwood approved ! that was good info 👨‍🔧 siu thanks

A overhaul can be done in less than 2 hrs that’s crazy

tire tread blocks also have different sizes for resonance, and when you described the pump, you mentioned how the pump "compresses" the fluid.... i like you so i wont rip ya on that lol

the bolts that hold the p/n switch and the 1 ne behind are 10mm the 2 on the side of the techm are 8mm

Some of the jokes in here caught me off guard. Those small channel locks specifically made me look away from the screen for a bit. XD

Thank you for taking the time to make this video. Sub'd and notified.

Great video, my best regarts to you and thank you for the time and information.

Great video! Glad I stumbled on it

Revenioux gear set I think 4r70w

I just had a new 6L80 put in my 4x4 2010 suburban I'm wondering when they changed the gear ratio the new transmission is lower geared then the old one but I like it better.the old one at 75 ran 1600 rpm and down shifted alot the new one at 75 runs 1900 rpm and holds 6th better doesnt shift as much .

What would happen if you add an extra steel/friction in the 3-5-R assembly? Was having a hard time obtaining proper clutch travel even with a thick snap ring?

Very good video Sean

Just finished repairing a "come back". Still having problems. When driving and take foot off the gas, it feels like the brakes are applying when coasting, like its downshifting but slows down l

Excellent video and excellent teacher.

Awesome video! Im converting my awd 6l80e to rwd, seems pretty straightforward just buy a rwd output shaft assembly and new tail housing and put it all back together ??

Excellent video thank you.

I appreciate you sharing knowledge for everyone to see. I have a 2008 Sierra and I have just pulled the engine to change out the cam bearings because it has low oil pressure. This is my first time pulling an engine and before this have only done basic repairs. With my limited knowledge I made a mistake when attempting to pull the engine out. I didn't loosen the torque converter bolts and when I was attempting to pull the engine out a quart or two of transmission fluid came out from the engine side of the bell housing. I was wondering if I screwed up the torque converter or if I will have to tear apart the transmission as well and do some repair to possibly the pump. After watching your video I am considering doing the transgo kit for the pump since the truck has 160k

6l90 ring gear is a crush fit I believe.

I replaced the selenoid shift control module on my 2018 1500 chevy and now it won't show the gear selector on the dash or move fordward but will reverse. HELP PRETTY PLS

Thank you! I'm dealing with a 6l80 intermittent shuttering and fluid is jet black, dropped pan replaced filter and fluid, helped slightly but, my transmission guy says torque converter is the issue, he wants small fortune and is booked out weeks, I own an appliance repair business and it's my only truck 😳 I thought about purchasing a torque converter and replacing that myself, just not sure if pump is toasted..

Do you have an upgrade converter you recommend for a Silverado 5.3 6L80? Thank you for this detailed video. It’s really nice to understand the drivetrain. Just subscribed.

During vacuum testing the valves in the valve body, how low is too low and requires the valve body to be replaced if the valves are new from Transgo? I noticed you had the 6-2 select test at 15 inches and seemed concerned but then didn’t say if it is acceptable or not. Thanks!!

Hi. Great learning video by the way. Which overhaul kit is a good one to go with. I'm looking at the atp master kit or a transtec kit with bonded pistons. Which kit has more to offer. My wifes 2015 sierra torque converter crapped the bed and now its time for a rebuild as $8000 in the shop canadian is just unrealistic for a transmission overhaul. Ill be also getting the sonnax zip kit a new stator and pump, and a new torque converter. Any help would be much appreciated. Ive rebuilt the 4l60e's. So now the 6l80 for the rebuild.

Hi, if it's not much to ask, I need help finding a part. I have a 2005 Ford Explorer 4x4 4.6l Limited. Well, I just resintly replaced the transfer case and when I went to put the new one on I noticed some oil dripping. It turns out that the seal on the transmission side needs replacing. Dealer don't make it anymore. Can't find an original part. What do your recommend? I believe it's called "transmission output shaft seal". Some help would be nice from anyone. Thanks

I have an 09 suburban with 6l80. 230,000 miles on it. I dont know if it's been rebuit or not. I have what i would describe as "shuttering" around 40-45-47mph at a normal acceleration what i would call 3rd into 4th gear (i could be wrong) with less, but some "shuttering " 4th into 5th. Some small rpm jumping duirng this, less thab 500 rpm. I notice that shuttering is lessened, or i just dont notice it as much when im at merging acceleration. I sitll owe 2k on this pile and have put years or work into it some im committed to fixing it. Im going to buy a screw press, compressor, slowly get ready, but what type of kits should i be buying? Im saving a lot of money doing it myself, so what's a nice mid range rebuild for this trans.

I rebuilt a 6l80 using this video. I still have a slip under hard load in second gear. The only thing I didn't replace was the stator gasket. Could a leak somewhere on that only affect 2nd? Pressure is only reaching about 450kpa in 2nd, but 650kpa in others.

Sir, can I install Sonnax high-performance pump slide spring 104534-HD for 100% STOCK GM 6L80? 2011 camaro SS. The Sonnax spring is stiffer than OE and is able to hold the pump slide in a maximum-volume position, despite increased pressure and high engine speed in performance applications.

This video si they better explain about this transmisión thanks

Please explain how the oil pump works and how it is spoiled

Good job ❤❤

I have an 08 gmc yukon 6l80 . I have a p0677 line pressure sol b stuck on. Truck has no gears at all. What am I looking at

hi do you have rebuild info for a mitsubishi delica d5 2007 cvt auto trans cheers mate

37min and 9 seconds you remove the silver washer is it normal to have wear on that part?

Do a rebuild video for a Dodge 545rfe transmission.

Hello Sean. I am hoping that you can point me in the right direction. Do you have a source for GM part numbers on the 6L80/6L90 transmissions? I have one apart & I seem to have misplaced the thrust washer that goes between the front input planetary & the 4-5-6 clutch housing assembly. The ATSG book shows a 4 tab washer. I assume that it's a 3 or 6 tab washer as the front planetary (6L90) has 6 holes. Thank you, sir, for sharing your wealth of knowledge.

Hello I have a question 2014 6L90 transmission does good until it heats up then it doesn’t want to pull in reverse, I have it torn apart but I don’t see anything worn. Can I please get your opinion? Thanks Herman Joned

Your excellent teacher

Great video What would cause first gear to go out completely one day and have it again the next? Did have a weird 1-2 shift under light throttle for a couple months prior. No codes btw

Hi there great video and very informative. My question is is there any way or any kit out there that changes the first gear ratio. Any information much appreciated. Thanks

hello sir good video once again. I am having issues and I wondering if you can give some input, i tested the low revers with compressed air as you did but I only got movement on the very right port. the second from the left did not make it move at all. The transmission is on the truck, just dropped the pan and tested it. there is still some fluid in the transmission. thank you for your help.

You have the best transmission stand I have ever seen. Did you invent that yourself?

I live in Carbondale and have been having problems with my 18 Sierra K1500 with the 6L80. Would you happen to know any good shops that do a proper overhaul locally? I dropped the pan and noticed the fluid was black, smelled foul, and the magnet was covered in metallic paste. Took it to a shop figuring it was the torque converter, they agreed but said the transmission didn’t seem to have any other problems. However, this wasn’t a transmission shop so I’m not sure how thorough they got. The problems I was having before the torque converter was replaced, they used an OE TC, are now pretty much all back. Kind of at a loss. Any suggestions would be much appreciated.

Thank you, You do very good job & great video. & What is the the best upgrade torque converter for 6L80 transmission? is it TCI torque converter, B&M Racing torque converter or RECON TOW PERFORMANCE TORQUE CONVERTER FOR GM 6L80/90 ???

Looking for the part numbers for the trans go kis you used on this video. thank you.

First off thanks for an amazing educational video of the step by step. Question what rebuild kit are you using bc I have the same transmission 6L80E MYC. And I’m trying to find one that includes everything I need

Thank you

I need a press like that. I can easily make one but I need that accessory your using. I've seen one before. What is it called, maybe even a part number?

think you

Wuaoooo what a video .:) nice .. it makes me to my own.

Nice

I believe there's a different piston drum, which has more surface areas on the edge of it, which allows the more pressure or easier pressure to be applied to the clutches, which is a upgrade aftermarket ,so are there other aspects of the internals which can make it stronger and last longer?

Thank you! I’ll be using this video when I burn my G8 clutches up.

If you machine the bell housing what about the pump housing thickess and the vanes. You are gonna need to do something to get that .001 to .002 back. You didn't say how to fix that part?

Hello,,,i juste built a 6l80,,,. i can not turn the shaft ( in bell housing ) by hand...but with some pliers its easy and smooth...is it normal,,,thank you

What happens if you have no free play in the 1-2-3-4 and 3-5-R clutch packs? i've disassembled and reassembled them several times and cant get the prescribed clearance. I thought there might be a problem with the pistons, but have redone them several times. Changing the snap ring thickness to the min wont make a difference. I bought the 6L90 trans out of a 2010 diesel ambulance with no fwd or rev movement. Fluid was not burned. I didn't check the filter for cracks which would be the most common cause. There was no metal in the pan and no obvious problems found with disassembly. Thanks Bob

Informative video except in your description, you refer to it as a transaxle. Not so - it is a longitudinal transmission.

I believe the main issues with these autos is poor maintenance not changing the fluids regulatory or using cheap tans fluids, always you OE spec oils and fluids and also if possible instead a external transmission cooler with a built in thermostat, GM Make a good one used in the Holden SS or chevy ss 2013 to 2017 models and even aftermarket ones are good, just make sure they have a built in thermostat that way the fluid temps rises before the cooling starts otherwise you have cold air cooling cold temps which will make transmission play up as it needs at least minimal operating temps which is why the transmission had lines going to the internal radiator coolers to help get the temp up to operating temps easter? Heat is your main enemy in transmissions?

Hola tengo un silverado 1500 2015,vivo en hollywood florida ,podria recomendarme al profesional de confianza y responsable para reconstruir mi transmision .

Keep up the great work, just wondering how much easier is it to have a filling tube put on ,as they are sealed units from factory i believe, also external trans cooler is worth its money in gold ( with a built in thermostat as well) :)

Which branch speed handle is that? Is that a mac x17?

07 Escalade AWD trans same as 14 Silverado 4x4 besides doin a reflash..?? Thanx for any info...

great.. thank you

The dome shaped tool that you use with the screw press. What is it called and where can I find one?

Looking at some of the videos while I'm at work, do you have one for taking a 4wd to a 2wd?

Anyone got a link to those big mamajama pliers?

Hello. Great video! It was such a great tool for reference. When doing an air test after a rebuild, all gears test good. However, the compensator doesn't hold pressure and leaks quite a bit. Is this normal? If not, can you recommend a starting place to look. Thank you!

I got 250,000 miles on mine proper care has been done to eat it just shifts a littler hard some times any idea?

Straight doctor

Very informative. Question..what year did they change from rotational rings to non rotational rings on the pump. My buddy has a 16 truck and smoked his 6L80 good. Hardly moves. Dealer told him ya ots the converter. I droped the pan and the fluid was thin, VERY dark and smeeled extremely burnt. Magnet had so much metal and even more in the pan wasn't even on the magnet. Well I've got a 11 6L80...can I just swap the "guts"

Please help lol!! I rebuilt my 6l80 I did air check all gears holding except compensator feed should it hold air like the clutches and gears I understand how it works just not sure if it should hold air did the test no converter , tail housing or valve body

Any idea what would cause a 6L80 to “fall” out of 1st gear idle and “snap” into 1st gear once the rpms get to 1,500(doesn’t consistently happen). But only on shift pattern X and Y. But Tap shift commanded 1st or 2nd no issue

What rebuild kit did you use for the clutch plates and steels?