Mine is great 98% of the time. Butter smooth, quick upshifts, i love it. Then you are driving through a parking lot at less than 10 mph, brake, gas, turn, CLUNK. I also get a bit of slip accelerating onto the highway first thing in the morning. Like if you rest your foot on the clutch while accelerating. Only with the wheels turned. I wonder if that is some computer torque management kicking in.
Oh well. I bought a 100K bumper to bumper through GM so it's their baby if I ever need it. No software updates to date on the trans. Seems pretty good most of the time. And pulls a trailer like a dream.
The old mercedes derived 5speed auto in my hemi charger clunks like that but at higher speeds, 45+ with brake gas, brake turn gas gas gas! applications. I think it may be the unfortunate marriage of computers, sensors and multiple gears packed into small cases.
My old 3 speed stage 2 turbo 350 with 400 hp 350 chevy in my hotrod clunks too. From first to second with a tire chirp every time above 2500. Thats how we like it though.
Nothing is perfect. But as these trucks get newer and more expensive our expectations grow with them. If I bought a new corvette that clunked like that I would be pissed that my wife vetoed the manual trans and cry in my whiskey glass at night.