Like the regular-duty version of the Sierra and Chevrolet Silverado, the heavy-duty version has been redesigned. The 2500 and 3500 HD models are offered in two- and four-wheel drive as well as the "dually" dual rear-wheel setup. Three bed configurations are available: a six-foot, six-inch standard, eight-foot long, and the Dually long. The standard engine is a 353-hp, 6.0-liter V8. A 365-hp, 6.6-liter diesel is available, which produces 660 foot-pounds of torque. Both motors are mated to a standard six-speed transmission. A work-oriented interior is offered in addition to more luxurious one that is similar to the one in the GM full-size SUVs.