2025 Gmc 2025 Denali Ultimate Dually Truck. Detailed specs and features for the 2025 gmc sierra 3500hd diesel denali ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders,. The denali trim moves to second place in the sierra hdโs hierarchy for the 2025 model year with the introduction of the new denali ultimate trim, available for both the 2500.
Crew cab short bed 4ร4; Denali goes ultimate, at4x joins the ranks.