The 2007 GMC Sierra 3500 Classic embodies its 'Classic' moniker, being the final year of the previous-generation, full-size, heavy-duty pickup truck offering from GMC. It features two drivetrain options – rear-wheel-drive and optional four-wheel-drive. Powering this behemoth is a standard 6.0-liter V8 producing 300 horsepower, with the choice of an upgraded 6.6-liter turbo-diesel V8, delivering an impressive 360 horsepower and 650 lb-ft of torque. Both engines come paired with an automatic transmission, but the diesel has an Allison 1000 six-speed, while the gasoline uses a Hydra-matic four-speed. The Sierra 3500 Classic boasts a dual rear wheel configuration, aiding its heavy payload and towing capacity. The infotainment system is relatively simple, falling in line with the truck's rugged, workman-like approach. Key safety features include ABS brakes and dual airbags. This model comes in three trims - WT, SL, and SLE, with an array of cab designs and bed lengths.