The 2007 GMC Sierra 2500HD Classic is a 3rd-Gen heavy-duty pickup truck known for its capability and durability. The truck came in 4WD and RWD options with a four-speed automatic transmission. There were three engine options: a 4.8L V8 producing 285 horsepower, a 5.3L V8 with 295 horsepower, and a 6.0L V8 packing 300 horsepower. The Sierra 2500HD Classic offered sedan and crew cab configurations with various trims comprising of Work Truck, SLE1, and SLE2. Notable amenities included AM/FM/CD audio system with XM Satellite Radio, OnStar, and climate control. A key safety feature was the dual-level airbags with passenger sensing system. There were no significant changes in the 2007 model year as it followed the 'Classic' design principles of its predecessor.