Relatively unchanged for 2013, the GMC Sierra 3500HD is a heavy duty full-size pickup truck with a maximum towing capacity of 22,600 lbs and DRW trim levels. The Sierra 3500HD is powered by a 6.0-liter V8 engine that produces 322 hp and 380 lb-ft of torque. For increased performance GMC offers a 6.6-liter turbocharged diesel V8 engine that yields 397 hp and 765 lb-ft of torque. Standard RWD and optional 4WD are 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, anti-lock braking (ABS), and tire pressure monitoring system (TPMS). The Sierra 2500HD is backed by a 3-year/36,000-mile warranty.