2021 GMC Sierra 3500 HD AT4

This 2021 GMC Sierra 3500 HD AT4 is a powerful and rugged heavy-duty truck designed for drivers who need serious capability, strong performance, and everyday comfort. Finished in Onyx Black with a Jet Black interior, this Sierra has a bold and aggressive appearance with the tough presence expected from a heavy-duty GMC truck. The Crew Cab layout provides a spacious and comfortable cabin with seating for five, making it practical for both work and personal use. Its interior offers a strong balance of comfort and function, with plenty of room for passengers, useful storage space, and a confident driving position that helps make long drives, jobsite use, and daily travel more comfortable. Powered by a V8 engine paired with a 10-speed automatic transmission, this Sierra 3500 HD AT4 delivers strong power and dependable performance for demanding driving needs. The 4x4 system adds extra traction and capability, making it well-suited for rougher roads, changing weather, towing, hauling, and outdoor use. Overall, this 2021 GMC Sierra 3500 HD AT4 is an excellent choice for anyone looking for a heavy-duty truck with bold Onyx Black styling, a comfortable Jet Black interior, smooth automatic performance, strong 4x4 capability, and the durability, strength, and versatility needed for work, travel, and everyday driving.