The standard 6.0-liter Vortec V8 engine produces 360-horsepower and the optional 397-hp/765 lb-ft of torque (335-hp/685 lb-ft of torque with Box Delete option) B20 biodiesel-capable Duramax 6.6-liter diesel is mated to an Allison 1000 transmission. Stability control, hill start assist and a trailer sway control system are standard. The Denali trim, available on the 4WD crew cab short-bed, features a unique grille, body color bumpers, polished forged alloy wheels and chrome accents. Available features include USB connectivity, rear back-up camera, Bluetooth connectivity, NavTraffic real-time traffic display, satellite radio, OnStar and a navigation system. For 2012, cruise control becomes standard on the Work Truck. Substantial revisions made in the previous model year, including a new frame, an improved Vortec V8, a new Duramax diesel and revised Allison transmission, new front and rear suspensions, and an improved brake system mean that the GMC Sierra 2500HD is carried over for 2012.