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. Available features include mobile WiFi, USB connectivity, rear back-up camera, Bluetooth connectivity, 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 Chevy Silverado 2500HD is carried over for 2012.