2024 Denali Ultimate 2500hd. 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, producing 470. The white frost tricoat (color.

The white frost tricoat (color. Explore the 2025 gmc sierra 2500 hd & 3500 hd denali luxury truck.