Featured First C8 transmission replacement

[Gilles27]

 

[Gilles27]

GM dealer technician here. Vehicle has 32 miles on it, driven conservatively in accordance with recommended break in procedures. The transmission has developed a small fluid leak, and is setting a DTC for the limited slip differential fluid pressure. After going through various levels of technical assistance and action center personnel, Tremec has opted to tear the unit down themselves. So, I get to put a box in it. I figured some of you would be interested in seeing one get torn apart, so I'll be adding pictures as I go today and likely tomorrow. So far, nothing earthshattering. The rear suspension comes apart a lot easier than the C7, but the engine support fixture is a bear. If anyone has any questions, let me know and I'll see if I can get an answer.

Update - subframe is on the ground, I have to go poke at something else for awhile. Heres an album with some notes. I'm on mobile, let me know if the album doesnt work.



Update 2 - trans is out. Took longer than anticipated, between putting out fires elsewhere and waiting on a cadillac dealer up the road to drop off the support fixturing - its repurposed from the 2.0t removal in the 2019 XT4. Overall, not a bad job. It's a little tight, but pulling the motor forward with a strap yields plenty of room to get the input shaft clear of the flywheel. Of course, GM will decide to pay me about 6 hours for the R+R, but for now, the labor ops are straight time across the platform. I'll update again during reassembly if anything interesting comes up, but let me know if you want to see anything in particular.

 

[GM MUSL]

Wow nice detailed view. That trans filter looks like it comes off with 4 bolts if I have picked the correct image. is that a easy DIY?

 

[Cariboocreek]

32 miles....interesting to see if this is a one off or the front end of a transmission trend.

 

[V8!]

Thanks for sharing!!!! Very interesting and good pics!!

 

[nKuch]

View attachment 37864

Wow this is an awesome view. Let’s hope this isn’t an issue on all of them!

 

[kerry4]

Maybe this shut down will work in our favour. Give GM time to fix deficiencies. Guess that 6 weeks of holding for quality control didn't do much.