I have a 2021 GMC Sierra…
I have a 2021 GMC Sierra 1500 with a 3.0 liter Duramax and the 10 speed transmission, it's currently at the dealer and has been for over a month getting it's second new transmission. It has already had the valve body replaced 3 times, 4 if you count the one they did this past month before this new transmission I'm waiting on. I bought the truck with 16k miles on it so GMC refuses to repurchase it, but all of the repairs have been fully covered because it has 59k miles.