Hey Phil and everyone, another one bites the dust. 98k miles 2019 Yukon. Mine is doing the exact same as what you described. What a shame. 5 years old and bought it brand new….Was curious what you ended up doing and how your trans has been, Phil?. Mines getting rebuilt Monday from a shop that knows these and I’m getting a billet convertor. I’m gonna bring up to him about the TSB about the thermostatic bypass valve for the 6L80. Effectively lowering the thermostatic valve operational temperature at 150 degrees instead of 190. Is that something I should definitely have done?. Another question I have is with going forward with a new rebuilt trans without the oem convertor, would it be wise to to delete the AFM on the engine?. I’ve read in other places that does not help these transmission
