2025 Gmc Sierra 3500hd At4 Towing Capacity. Detailed specs and features for the 2025 gmc sierra 3500hd including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders,. Learn how this vehicle combines exceptional payload.

2025 gmc sierra 3500 hd crew cab specs, features & options. Towing and payload capacity the strongest sierra 3500hd can pull as much as 36,000 pounds.