Gmc 2025 Denali 2025 Hd Denali. Identical content as the 2023 model's denali. The denali trim moves to second place in the sierra hd’s hierarchy for the 2025 model year with the introduction of the new denali ultimate trim, available for both the 2500.

Detailed specs and features for the 2025 gmc sierra 2500hd diesel denali ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine. Incredibly smooth powertrain for daily driving.