Used 2021 GMC Sierra 1500 AT4

Description for 2021 GMC Sierra 1500 AT4 Crew Cab

The 2021 GMC Sierra 1500 AT4 embodies the perfect combination of rugged capability and premium refinement, built for drivers who want a truck that performs as powerfully on the trail as it looks on the street. Finished in a bold exterior color that accentuates its aggressive styling, the Sierra AT4 features a distinctive black chrome grille, red recovery hooks, and unique AT4 badging that highlight its off-road attitude. LED signature lighting, projector-beam headlamps, and bold C-shaped daytime running lights give it a commanding road presence, while the factory-installed two-inch suspension lift and 18-inch machined aluminum wheels with Goodyear Wrangler DuraTrac all-terrain tires ensure it's ready to conquer any terrain. Skid plates, dual exhaust outlets, and body-colored bumpers complete the athletic, functional design that defines GMC's professional-grade craftsmanship.

Powering the 2021 Sierra AT4 is a standard 6.2-liter EcoTec3 V8 engine producing 420 horsepower and 460 lb-ft of torque, paired with a 10-speed automatic transmission that delivers smooth and responsive shifts. For drivers seeking a balance between power and efficiency, available options include a 5.3-liter V8 or a 3.0-liter Duramax Turbo-Diesel inline-six, both offering exceptional torque and towing capability. The AT4's advanced four-wheel-drive system with a two-speed transfer case and Hill Descent Control ensures optimal traction and control across any terrain. With a maximum towing capacity of up to 9,200 pounds when properly equipped, the Sierra AT4 performs as confidently on the jobsite as it does off the grid.

Inside, the Sierra AT4 offers a refined and spacious cabin that blends luxury with durability. Premium Jet Black leather-appointed seats with Kalahari accent stitching create a rugged yet sophisticated look, while heated and ventilated front seats, a heated steering wheel, and dual-zone automatic climate control deliver comfort in all conditions. The Crew Cab configuration provides generous rear-seat legroom and under-seat storage, making it perfect for both work and family life. Soft-touch materials, aluminum trim, and detailed craftsmanship give the cabin a premium feel that complements its performance-focused nature. Every detail, from the AT4-branded floor liners to the available sunroof, reflects GMC's dedication to quality and comfort.

Technology in the 2021 Sierra AT4 is advanced, intuitive, and seamlessly integrated. The 8-inch GMC Infotainment System features Apple CarPlay, Android Auto, Bluetooth, and available navigation, allowing you to stay connected wherever you go. The 8-inch digital driver information center provides customizable vehicle data, while the available Head-Up Display projects key information directly onto the windshield for convenience and safety. The available Bose premium sound system delivers crystal-clear audio throughout the cabin, and modern conveniences like wireless charging, multiple USB-C ports, and an onboard Wi-Fi hotspot keep passengers connected and powered on the go. The MultiPro Tailgate-offering six functional positions-adds exceptional versatility for both work and recreation.

Safety remains a key strength of the 2021 Sierra AT4, with standard and available driver-assistance features designed to enhance confidence behind the wheel. GMC's Pro Safety package includes Forward Collision Alert, Automatic Emergency Braking, Front Pedestrian Braking, Lane Keep Assist with Lane Departure Warning, and IntelliBeam automatic high beams. Available technologies such as Adaptive Cruise Control, Rear Cross Traffic Alert, Lane Change Alert with Side Blind Zone Alert, and HD Surround Vision provide added peace of mind. The AT4's robust frame construction, advanced airbag system, and StabiliTrak Electronic Stability Control system ensure a solid foundation of protection on every drive.

The 2021 GMC Sierra 1500 AT4 is where off-road toughness meets refined luxury. With its powerful engine lineup, premium interior, and trail-ready features, it's built for those who demand both capability and comfort from their truck. Whether you're hauling heavy loads, navigating challenging terrain, or simply enjoying the open road, the Sierra AT4 delivers a confident, elevated driving experience that lives up to GMC's professional-grade reputation.

Walt Massey dealerships proudly include a complimentary 3-month/3,000-mile powertrain warranty on eligible used vehicles through Owner Services, Inc. This coverage protects major components such as the engine, transmission, and drive axle, and includes towing assistance and rental reimbursement for unexpected breakdowns-providing lasting confidence long after you drive off the lot.