2025 Gmc Sierra 1500 At4 Specs. A 2025 gmc sierra 1500 has a maximum towing capacity of 13,200 pounds when properly equipped. Detailed specs and features for the 2025 gmc sierra 1500 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain and more.

Detailed specs and features for the 2025 gmc sierra 1500 diesel at4 including dimensions, horsepower, engine, capacity, fuel economy, transmission, engine type, cylinders, drivetrain. See the complete list of 2025 gmc sierra 1500 changes, updates, and new features here at gm authority.