The GMC Sierra 2500HD is a heavy duty full-size pickup truck with a maximum towing capacity of 17,800 lbs. GMC offers a 6.6-liter turbocharged diesel V8 engine that yields 397 hp and 765 lb-ft of torque. The 4WD is paired to a 6-speed automatic transmission. Features include 22-inch wheels, hands-free phone capabilities, steering wheel mounted controls, rear vision camera, navigation and heated exterior mirrors. Safety is comprised of advanced airbags, StabiliTrak stability control system, and anti-lock braking (ABS),