BUILD VIDEO,,,, Main case assembly of the 6L80 transmission. 

The level of knowledge displayed here is simply amazing. I drive a 6L80E and have begun looking for a shop with similar skills, hoping to prevent a complete melt down. Thanks.

You are a great mechanic, used to rebuild 730. 731 Allison transmissions for the bus company in Saint Louis, also built Detroit engine’s. I worked in several other departments over my 26 years there. The last 13 years as a supervisor. Also built E4od ,4r100, c6 and differentials. Am 72 years old now and as I stated before, I love your videos. I know a good mechanic when I see them. You are very good. Productive also. I give you 5. Stars. Your new friend from Missouri!!!

I have to say folks, this gentleman, Dave is the greatest and knowledgeable and extreeeeeeeeeeeeeemly helpful if you need info to get your 6l80 to last into the 200K mile plus range. Dave you are awesome man. thank you so much.

Nice video man. Props to the cameraman/editor, you are getting a lot better man

Love your video’s. It’s nice to watch someone who knows exactly what they are doing . Thank you!!!

really sucks this doesn’t get more views, priceless information

That bad boy is mine. Christmas in august! Removed my old transmission. Came to find out that it had at most 2qts of trans fluid in her. I honestly dont even know how that happen. I checked and rechecked my trans fluid so many times at idle and it always read on point. Took it to 2 shops and they told me the same thing. No visible leaks or nothing. Trans didnt even smell bad. SUCKS!! But with all this i came across david and thanks to him i should have this escalade running by later this week. Im still impressed with this guy. Been there answering all my questions till today. Great guy to do bussiness with.

Thanks for the build video. I know there is a lot of tear down videos out there and I know the extent of building a transmission much less recording it. Thank you for taking the time to make this build video. You do awesome work.

It's great to see a build video. 👍

Thanks for the detailed end play setup demonstration that helps a lot! And I spy a Pantera Far Beyond Driven tattoo 🤘🤘

Great info right there FOLKS!! Thanks for the vid.

Thanks David for sharing your knowledge. I haven't been able to find the OA endplay specs for the 6L80/90 anywhere. It's absent from the ATSG manual. I'm pretty sure that Sonnax makes a selective pump thrust washer to take up play between pump & 3-5/R.

Thanks for taking the time capture your knowledge/expertise on video to share! Rebuilding my 6L80 in a 2014 Silverado, failed torque converter at 120k miles. Utilizing the upgraded Sonnax/Transgo components you recommend. Preferred to have my reputable local shop do the repair but their backlog was ~6 weeks to get to it. Videos like yours and an ATSG manual allowed me to tackle the project myself.

Great job! Do you have a video or list detailing the parst list you used? Possibly the best place to order? Thanks for your video!

Great videos. I like the way you assemble everything clean. And I like the fact that you like to replace parts with new parts. You have mentioned measuring the clearance between a new pump and rotor with a feeler gauge, but I haven't heard you say what the clearance should be? And how do you adjust it if it's not within specs. Can you tell me what the procedure and specs are and how to adjust it. Keep the videos coming. Thanks.

I'm getting ready to do my first 6L90. Had a converter failure and destroyed the pump as most of them do. I'd like to go with the same parts you use but I'm having a hard time figuring out what I need or don't need. Do you have a parts list by chance?

I watch this and im like hmmm its almost as if hes done this before Lmao :) Im In KC so its good to know there is someone semi close that takes pride in their work. So if i need work done im sure gonna try to bring it to you first.

Thanks for the videos David, very helpful, I am in the process of putting my 6L80 back together and the large snap ring that holds the center support won’t go back in, the clearance is slightly too small, I can get it in but it won’t go in all the way, makes the shaft really hard to turn because of the tightness. Any suggestions, I have triple checked all the bearings and bushings.

For anyone following along with this build Shift Technologies now says their shims must go on top of the bearing instead of underneath. It looks like the instructions got updated the same month as this video.

Hey buddy thanks alot for you 6L80 content , i had a question do you know if the 6L80 trans re seal kits are the same 07-13 and 14 up ? GM 24272471 looking at this kit for the 13 down

David, I have a 6L80 from a 08 Escalade RWD and it won't move forward nor back and if you leave it running in park and come back to it 20 mins later the trans temp is at 190-200 degrees which never happened before. Can you shine some light on this cause I'm lost right now. It also has been rebuilt 4 times already... under warranty

I’m learning a lot from yr vids but I noticed u didn’t use an alignment tool for the pump, is that not critical or did u just do it by “feel”?

How much did you charge them cuz I'm gonna need a rebuild already on my 2018 silverado idk if it was torque converter or what Rough estimate on what people charge..

I seen on one of your builds that you used a special pump for mild to heavy horsepower, who makes it?

Hey Dave, I rebuilt a 6l80 and installed in 2015 Tahoe. Seems to be stuck in limp mode 3rd and reverse work. Manual and tow mode won't illuminate on the dash.. any idea? Thanks

Way cool, thanks for taking the time to contribute to the success of others. I am getting ready to do my first 6L90 trans rebuild, so just taking it all in so far. I have 2 questions on your work (questions, not digs, for my learning): 1. I see you did not use a pump alignment tool when bolting the stator to the bellhousing. I was just going to use a really large hose clamp. Maybe one can just eyeball or feel it after you have done 100 like you have? 2. It looks like you are assembling clutch plates without soaking them first. I heard you don't need clutch spring compressors if you do this. True? OK, one more: If I already have the large snap ring pliers for the center support, would I need any others in order to rebuild a 6L80/90? Think I could use a PVC coupler and C clamp to compress clutches and pistons instead of the correct screw clamp that you had? Thanks a bunch again. Really appreciate it.

Please recommend a rebuild kit for 2015 GMC Sierra 1500 4x4 6L80E transmission. GM dealership told me 8K for a reman. I feel as though dealership is throwing me a line of BS. They stated " found transmission pan full of metal from oil pump scoring torque converter housing and pump cover restricting fluid filter and causing a neutral condition." doesn't make sense because the pan has never been removed. Love your channel and appreciate your expertise! VR

08 6l80e air pressure test into 1234 hole it bleeds into 456 hole and one right next to it?

I thought there would be more transmission fluid applied to the parts as they were assembled.

Where was pump alignment tool supposed to use it

I'm in a 2012 Silverado, 5.3l. 138k miles. It was amazing to me just how fast the symptoms appeared compared to a Ford I once owned. Within one week, it went from driving along some mountain roads smooth as silk. Then, on the next hill, it started what I thought was an engine miss. Then, on cold weather mornings the last few days, and I hear a scraping sound upon start, with very significant slipping while driving. Putting it in trailer/tow mode nearly eliminates the slipping. I did get the fluid flushed and changed yesterday. It did improve, but still there. It was almost a clear red, but with a head scratch, the technician said it could probably use a change. Question is this: are there cost options on the repair, as in just a torque converter, or is the cost on removal, tear down and reinstall enough to just warrant a full rebuild?

Did your parts washer go "sour" on you? I've seen that dark gray effect on cases before & it's always the parts washer needs a good cleaning, fresh water & detergent.

Great video I’ve been studying up on rebuilding on I have one in my 2010 Silverado fixing to hit 250k and I’m a mechanic by trade so for some reason I want to tackle the job myself but it seems like the main thing is going to be getting the part numbers on what to upgrade. Are there any good manuals out now that give the sonnax and the TransGo part numbers and what to use acdelco? Any help would be appreciated. Definitely subscribing

🦾Great job👍, we thank you a lot for it, but at 5:35 why did you drill this hole, and what is the benefit of it?

Dave i took apart a 6l90 and it has 6l80 clitch packs. 1 less disc and steel in most of the packs like an 80 would have but it is definitely the longer 6l90 case. Thoughts on that?

When installing the valve body does the shift lever have to be in a certain position when installing the bar with roller bearing? Great videos by the way. Very informative

whats the cost on just the parts?

I have a 2018 Yukon with a 6L80 and 142k miles. Still drives great. Should I spend the money to get the torque converter replaced now? I hear the transmission is reliable as long as the TC doesn’t destroy itself so my thought is that by changing the TC before it dies that I can get many more years and miles or off the transmission.

ive got a question... and I'm having a hard time finding answers. i cant find out why I have 9 torrington bearings anbd thrust washers, but only see seven installed in the videos? I'm on a budget, and I'm confident that I could refresh my transmission, but I am stuck. the output shaft will turn one way but locks the other way. I don't understand what I did wrong.

I didn't see you use a pump alignment band is it not as critical as they claim or is an eye ball good enough?

I HAVE A 2014 6L90 THAT I JUST REBUILD AND NOW IT DRIVES AND CHANGES GEARS GOOD BUT AFTER A WHILE OF DRIVING WHEN I STOP IT WILL STOP PULLING IN FORWARD AND REVERSE WHEN I TURN THE VAN OFF AND BACK ON IT DRIVES CORRECTLY UNTIL I STOP PLEASE HELP

What torque converter do you run when you do these rebuilds on the 6l80s obviously acdelco is factory choice but I’ve heard several people suggest ones with billet covers. What are your thoughts since you seem to reply to people :)

About what is the cost of all that

Dave, part number 104004BP does not come with steels and bonded pistons which in my case was requested by builder. That part number for master kit (transtar) is 104006AP. SO I had to order (transtar )steel module R104119B FYI.

Why are you drilling the hole in the pump play

Why didn't you use an alignment tool to properly align the pump cover while torqueing it to the bell housing? Isn't this required for proper pump alignment? It is pointed out in the manual..

I have a question, what if there is 0 end play. What should I be looking for. Thanks

Isn't there a stator to pump alignment tool?

You torqued the bellhousing bolts to 32 ft/lb, yet the ATSG manual says 53 ft/lb. I personally feel 53 is a bit much considering the bolts are in aluminum. I assume experience has taught you the same...

Could you do a video of the parts you use on the 6L80 if you haven't already.

Many vanes in that pump