Whole thing is though your only going from a 34.1” to a 35 not much change but cool bolt on.
I’m putting 37x12.50x20’a using stk wheels on my 20 at4 Duramax
2””’zone levelling kit n a little real careful trimming n should b good
20 D max AT4 almost 3000mi averaging an easy 15 mpg, best around 23 on the computer.
Way better then my 19 D max.
Yeah 10 speed helps but I think there’s more going on then that from 19 to 20.
Don’t do much towing hardly any just haul in’ my ass around.
Amazing daily driver Once you get used to the size.
tons of cameras & mirrors can pretty much park anywhere if you take your time
amazing ride big improvement 19 to 20 IMO