GMC Sierra 3500 Heavy Duty Truck is available at Jim Autos United States and Canada. GMC Most Powerful Duramax Diesel Ever The available All-New 6.6L Duramax Diesel Engine 445 Horsepower 910 lb.ft. of torque 12% increase in horsepower and 19% increase in torque vs previous model Learn more on GMC Life GMC Sierra 3500 Enhanced Driveline and […]