2025 2025 Gmc 3500hd Duramax. A forum community dedicated to chevy and gmc duramax diesel owners and enthusiasts. Detailed specs and features for the 2025 gmc sierra 3500hd diesel denali ultimate including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders,.
* and an available max towing capacity of up to 36,000 lbs. How does the size affect performance?