2024 Denali Ultimate Duramax Review. Discover the 2024 gmc sierra 2500hd & 3500hd denali and the first ever denali ultimate, with 30,800 lbs max towing, premium comfort, and more. 2024 gmc sierra 2500 and 3500 hd first look:

Purchased a 2024 2500 diesel denali ultimate. 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 l5p duramax diesel engine,.