The 2015 GMC Sierra 1500HD Classic is a half-ton pickup in its third generation, prized for its robust performance and luxurious accommodations. It features three trims: SLE, SLT, and Denali. Both RWD and 4WD drivetrains are available, paired with a six-speed automatic transmission. Engine options include a standard 4.3L V6 with 285 horsepower, a 5.3L V8 with 355 horsepower, and a 6.2L V8 with 420 horsepower in the top-range Denali. Safety features include antilock disc brakes, traction and stability control, front and rear-seat side airbags, and side curtain-length airbags. The infotainment system features an 8-inch touchscreen with Apple CarPlay and Android Auto. A rearview camera, navigation, and a seven-speaker premium Bose audio system are also available in higher trims. The 2015 model saw the introduction of the Magnetic Ride Control suspension in the Denali trim for a more refined ride.