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thanks for everyone's input, trans got better then bad again after doing a reset, much worse, I did another reset then traded it!

Got the HP tuner up and running, wish I had known of this tuner before I got the diablo...oh well. I've been doing some data gathering, and watching the trans temp, not seeing anything weird, seems...

Good information, I haven't ran across this in my reading, I will look into the trans temp!

It does have the Mobil 1 blue label fluid, a reset of the adaptive learning has not been done. I will put that on my list to do.

Hello everyone, first post! I need some guidance, input on whether to purchase HPT for transmission tuning on a 2015 Sierra Denali 6.2 8sd. I bought the truck knowing of trans issues, but didn't...