GMC Sierra 3500HD is a full-size heavy-duty pickup truck that was introduced in 2006 by General Motors Corporation. It is available in two-door regular cab, four-door extended cab and four-door crew cab body styles. The Sierra 3500HD is powered by a 6.6 Litre V8 engine which produces up to 360 hp and 380 lb-ft of torque. The engine is paired with either a six-speed automatic or a heavy-duty six-speed manual transmission. Standard features on the Sierra 3500HD include a rearview camera, rear parking sensors, airbags, stability control, and traction control. Available options include various off-road packages, all-terrain tires, and a 6.6-litre diesel engine.