2025 Gmc Denali 2025 Ultimate Duramax. 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 slashgear team gets behind the wheel of the 2025 gmc sierra 1500 denali ultimate to see if its luxurious features and performance justify the price.
The luxury pickup you wonโt want to get dirty. The 2025 gmc sierra hd denali ultimate, refreshed for the 2025 model year, is gmc’s most premium, luxurious and technologically advanced truck yet.