Used 2021 GMC Sierra 1500 AT4

Description for 2021 GMC Sierra 1500 AT4 Crew Cab

The 2021 GMC Sierra 1500 AT4 is built for those who demand power, capability, and premium refinement in one rugged package. Designed to dominate both pavement and trail, the AT4 pairs advanced off-road engineering with the comfort and sophistication of a luxury truck. Under the hood, it's powered by the potent 6.2-liter EcoTec3 V8 engine producing 420 horsepower and 460 lb-ft of torque, paired with a 10-speed automatic transmission. This combination delivers exceptional towing capability-up to 11,800 pounds-and effortless acceleration. The available 3.0-liter Duramax Turbo-Diesel option adds remarkable fuel economy and torque-rich performance, making the AT4 equally suited for work or adventure.

The AT4's off-road credentials are second to none, featuring a factory 2-inch suspension lift for added ground clearance, a 4WD system with a two-speed transfer case, and Rancho monotube shocks that smooth out even the roughest terrain. Skid plates, Hill Descent Control, and an automatic locking rear differential ensure the Sierra remains composed in challenging conditions. With multiple drive modes including Off-Road and Tow/Haul, this truck adapts seamlessly to whatever the day demands.

The exterior of the Sierra 1500 AT4 strikes a bold balance between toughness and style. Its aggressive stance is defined by a black chrome grille with red recovery hooks, LED signature lighting, and body-color bumpers. The sculpted hood and muscular lines emphasize power, while 18-inch machined aluminum wheels wrapped in all-terrain tires underscore its trail-ready capability. Distinctive AT4 badging, integrated dual exhaust tips, and optional 20-inch black wheels complete its premium off-road appearance. The available MultiPro Tailgate with six functional configurations adds practicality and innovation to match its bold design.

Inside, the AT4 delivers an upscale, comfortable environment built for long days and rugged adventures. The cabin features Jet Black leather seating with Kalahari accents and contrast stitching, heated and ventilated front seats, and a heated steering wheel for year-round comfort. Premium materials, soft-touch surfaces, and real aluminum trim reflect GMC's commitment to craftsmanship. The spacious rear seat area provides excellent legroom, and clever storage solutions like rear seatback compartments and under-seat bins maximize utility.

At the center of the dash sits GMC's 8-inch Premium Infotainment System with Apple CarPlay, Android Auto, Bluetooth, and navigation capability. The available Bose premium audio system fills the cabin with crystal-clear sound, while wireless charging, multiple USB ports, and 4G LTE Wi-Fi keep everyone connected. The driver information center and head-up display provide real-time data like off-road angles, towing info, and navigation directions directly within your line of sight.

Safety and confidence come standard, with available features including Forward Collision Alert, Lane Keep Assist, Front and Rear Park Assist, and Rear Cross-Traffic Alert. The HD Surround Vision Camera System gives a complete view around the truck, making tight maneuvers and trail navigation easier and safer.

The 2021 GMC Sierra 1500 AT4 blends rugged performance, advanced technology, and first-class comfort like no other truck in its class. It's built for those who expect their vehicle to handle the rough stuff without sacrificing refinement-powerful, polished, and undeniably capable.

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, while also including towing assistance and rental reimbursement for unexpected breakdowns-offering lasting confidence and peace of mind for every mile in your GMC Sierra 1500 AT4.