Used 2021 GMC Sierra 1500 AT4

Description for 2021 GMC Sierra 1500 AT4 Crew Cab

The 2021 GMC Sierra 1500 AT4 delivers the perfect fusion of premium comfort, rugged off-road capability, and professional-grade power, built for drivers who want both refinement and adventure. Finished in a bold exterior color that highlights its athletic stance, the Sierra AT4 commands attention with its exclusive dark chrome grille, body-color bumpers, and signature red recovery hooks that emphasize its trail-ready attitude. C-shaped LED headlamps, LED fog lights, and 18-inch machined aluminum wheels wrapped in Goodyear Wrangler DuraTrac all-terrain tires give it a confident, aggressive presence. The factory-installed 2-inch suspension lift, off-road skid plates, and striking AT4 badging complete a look that's as functional as it is fearless.

Powering the 2021 Sierra 1500 AT4 is a 5.3-liter EcoTec3 V8 engine producing 355 horsepower and 383 lb-ft of torque, paired with a 10-speed automatic transmission for smooth, commanding performance. For those seeking maximum strength, an available 6.2-liter V8 delivers 420 horsepower and 460 lb-ft of torque, while the 3.0-liter Duramax Turbo-Diesel option offers exceptional torque and fuel economy. Standard four-wheel drive, a two-speed transfer case, and Hill Descent Control ensure optimal traction and stability in all conditions. With an available towing capacity of up to 9,400 pounds, the Sierra AT4 proves itself as both a capable off-roader and a confident hauler. The off-road suspension with Rancho monotube shocks and automatic locking rear differential provide outstanding balance, making every journey smooth and controlled-whether on rocky trails or paved highways.

Inside, the Sierra AT4's cabin is designed to combine luxury with durability. The interior features Jet Black leather-appointed seating surfaces with exclusive Kalahari accent stitching, giving it a refined yet rugged feel. Heated and ventilated front seats, a heated steering wheel, and dual-zone automatic climate control make every drive comfortable in any weather. The driver enjoys a 10-way power-adjustable seat with memory settings, while the spacious Crew Cab design offers exceptional legroom for passengers in the rear. Premium materials, soft-touch surfaces, and detailed craftsmanship reflect GMC's professional-grade quality, and thoughtful touches such as under-seat storage and a large center console add convenience for work or play.

Technology in the 2021 Sierra AT4 is state-of-the-art and seamlessly integrated. The GMC Infotainment System features an 8-inch color touchscreen with Apple CarPlay, Android Auto, Bluetooth, and available navigation for easy access to media, maps, and communication. The 8-inch driver information display provides customizable performance and vehicle data at a glance. A premium Bose audio system delivers immersive sound throughout the cabin, while wireless phone charging, USB-C ports, and a built-in Wi-Fi hotspot keep everyone connected. GMC's MultiPro Tailgate, with six functional configurations, enhances utility and versatility for loading, hauling, and working directly from the bed.

Safety and confidence are built into every Sierra AT4, with advanced driver-assistance systems designed to enhance awareness and control. Standard and available features include Forward Collision Alert, Lane Keep Assist with Lane Departure Warning, Automatic Emergency Braking, Front and Rear Park Assist, and Rear Cross Traffic Alert. Lane Change Alert with Side Blind Zone Alert and the available HD Surround Vision Camera system add further protection. The Sierra's high-strength steel frame, advanced airbag system, and StabiliTrak Electronic Stability Control system contribute to a solid foundation of safety and durability.

The 2021 GMC Sierra 1500 AT4 is more than just a truck-it's a statement of strength, sophistication, and capability. With its off-road engineering, luxurious interior, and powerful engine lineup, it's designed for those who expect their truck to perform everywhere-from the worksite to the mountain trail. Equal parts tough and refined, the Sierra AT4 embodies GMC's professional-grade philosophy with confidence, comfort, and uncompromising performance.

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.