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Each time mine has gone in I had to go over 1000 miles for the fast adapt learning to finish and the shudder, jerking and clunking on cold starts returned. It has happened 3 times now. The first time they flushed, the 2nd time they did another fast adapt learn and now I'm in a loaner waiting to hear outcome.
I honestly think the lock-up solenoid programming (slip tables) are to blame. Replacing with a good triple disc billet TC would be the best approach, but that voids the entire drivetrain warranty. At this point, I'm more afraid of the car not having a warranty. It all started around 10k miles and I'm now at 20k.
Sadly, GM has a serious reliability report issue with every vehicle running the 8L80/90 transmission. There are frequent reports from Corvette, Camaro, Silverado/Sierra, CT6, CTS & Escalade/Tahoe/Yukon owners. The ATS & Colorado don't have as many complaints, but those two vehicles are also the lowest volumes sellers of the bunch.
I certainly hope each model refresh quickly moves to the 10Lxx replacements. Maybe GM will address the current 8Lxx issues with a better converter and a little reprogramming so we don't have to void our warranties to get these cars running correctly.
And taming the slip tables wouldn't be a bad thing. The converter doesn't unlock properly above 60mph anyways, so there is no interstate coasting to save fuel at the highest drag resistance. Removal of the slip table might drop MPG about 2%, which is nothing compared to losing AFM, which has a 10% MPG bump at 70mph, 20% at 60mph and 30% at 45mph. By the time you hit 85mph, AFM benefits are nullified.
I'd rather lose the slip tables than AFM.
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