The 2007 GMC Sierra 2500HD is a heavy-duty pickup part of the model's second generation. This truck comes with two engine options: a standard 6.0 liter V8 delivering 353 horsepower or a 6.6L turbodiesel V8 with 365 horsepower. Both engines mate to a six-speed automatic transmission. Rear-wheel drive comes standard with optional four-wheel drive. Three trims are available: Work Truck, SLE, and SLT, each offering progressively more luxury and convenience features. Notable features include an available navigation system and Bose premium audio system, as well as a Dual-Stage frontal airbags as a part of its safety system. A unique feature for this model year is the new fully boxed frame which provides increased stiffness and durability while reducing noise and vibration in the cab.