6l80 preventative measures

a1smith · March 2

On 11/30/2022 at 11:24 AM, Grumpy Bear said:

Here's an explanation of the issue from the people that make the parts used to modify them:

6L80, 6L90 Transmissions: Consider an Updated Converter in Your Next Rebuild | Sonnax

Here is another article that complements the Sonnax article; it has more information on the waviness of the cover's clutch surface along with some nice pictures.

https://gearsmagazine.com/magazine/another-problem-with-the-6l80-90-converter/

msg122 · March 31

Hey everybody. I'm finding some great tips and information in this thread that hopefully I can apply to my situation. I'm the original owner of my 2014 GMC Sierra 1500. It has 220k miles on it. All highway commuting and never towed. Just hauling stuff in the bed. I've followed all the GM service recommendations and recalls. After my warranty expired, I found a mechanic shop that specializes in GM and AC Delco parts. This truck has never been a smooth shifter and I've learned to deal with it, but in the past couple of months I began to feel a shudder when shifting. It's always right between 1600-2000 rpms. At stop lights it will start to roll like its in neutral and I'll have to feather the brake and gas a little bit to get it in gear, similar to manual transmission. Once the truck is rolling it shifts fine between the rest of the gears. The same goes for reverse too.

I'm not in a position to buy a new vehicle at the moment. Which also means I don't have the money for a replacement transmission. All things have a shelf life and its an 9 year old truck with 220k miles so I'm being realistic here, but can I salvage this? I've done some searching on this site and I've see owners post about similar problems and claiming a new torque converter usually does the trick. I have the money to spend on a new torque converter, but I can't afford to keep taking it back and forth to a shop to continue diagnosing the problem. I just wish I knew that was problem and can be fixed. I've also see a ton of posts about switching transmission fluids, throwing in additives etc. You can really go down a rabbit hole in terms of solutions and it gets a bit overwhelming. Can anyone offer up any advice, tips, personal experiences? I love my truck. I'm the one owner and I've racked up all the 220,000+ miles on her. Don't want to get rid of it just yet guys.

No Tyme · April 3

Well the trucks is getting the original pan dropped this week, filter change and I am having this pan with a drain plug installed. Hope the drain plug does not interfere with the filter.

Anyone put the plug in this area?

I have no idea how much clearance there is in this area

Edited April 3 by No Tyme

Grumpy Bear · April 3

39 minutes ago, No Tyme said:

Well the trucks is getting the original pan dropped this week, filter change and I am having this pan with a drain plug installed. Hope the drain plug does not interfere with the filter.

Anyone put the plug in this area?

I have no idea how much clearance there is in this area

See that horseshoe in the bottom of the pan? Top of the photo. Filter rest on that. IF the drain is equal to or lower than that, no problem.

No Tyme · April 3

1 hour ago, Grumpy Bear said:

See that horseshoe in the bottom of the pan? Top of the photo. Filter rest on that. IF the drain is equal to or lower than that, no problem.

This should do it... Thank you Grumpy Bear