2015 6.2 8 speed z71 here.
Thought Id drop a line here for anyone interested. Ive had my truck at the dealership multiple times for torque converter shudder. It didnt develop a shudder until prob 15k miles. But from day one, the transmission always seemed a bit off. Sloppy shifting, shaking, ect, just weirdness. A few months ago, I had the TC replaced to address the shudder issue, but not a damn thing was fixed. Nothing. So I dropped it off last week following a stent in limp mode one day. Seems as though they hired a trans tech that actually knows what hes doing. He followed GMs recommendations and the shudder was never fixed. So FINALLY, GM agreed to give me a brand new Tranny. I picked my truck up a few hours ago and drove it 30 miles home and it drives like a totally different truck. NO SHUDDER, CRISP SHIFTS, RIGHT GEAR CHOICES.
Oh and no hesitation when putting it into gear like before either
Just thought Id let you guys know.