2024 Denali Duramax 2024. The sierra 2500hd denali ultimate looks to elevate the brand’s premium status, with a refreshed duramax, a new exterior, and more. 2024 gmc sierra 2500hd and 3500hd pickup trucks equipped with the denali ultimate trim are the only truck in gmc’s lineup that come standard with the 6.6l.

Carbuzz tested a sierra 1500 denali ultimate with the optional duramax engine, one of the few diesel trucks left on the market now that ram killed the ecodiesel. 2024 gmc sierra 2500hd and 3500hd pickup trucks equipped with the denali ultimate trim are the only truck in gmc’s lineup that come standard with the 6.6l.