Built for those who want premium comfort with real off-road capability, this 2021 GMC Sierra 1500 AT4 Crew Cab 4WD strikes the perfect balance between rugged performance and upscale refinement. Powered by the 5.3-liter EcoTec3 V8 paired with a 10-speed automatic transmission, it delivers smooth, confident power on any terrain. Distinctive 20-inch machined aluminum wheels, factory-installed running boards, and AT4-exclusive styling set it apart visually, while the interior features premium materials, advanced technology, and smart storage solutions. With its off-road suspension, 4WD capability, and bold design, this Sierra AT4 is ready for work, travel, and adventure alike.
Equipment & Features
CarFax One Owner
Powertrain & Capability
5.3 L EcoTec3 V8 engine (355 hp / 383 lb-ft torque)
10-speed automatic transmission
Autotrac 2-speed transfer case with selectable 4WD modes
Off-Road Suspension Package with Rancho monotube shocks
Hill Descent Control
Skid plates and factory-installed recovery hooks
Automatic locking rear differential
Trailering Package with integrated trailer brake controller and Hitch Guidance
Exterior & Design
20-inch machined aluminum wheels with dark gray accents
Factory AT4 tubular running boards
Signature AT4 grille with red tow hooks and body-color bumpers
LED headlamps, fog lamps, and taillamps
GMC MultiPro Tailgate with six configurable functions
CornerStep rear bumper and spray-on bedliner (if equipped)
Power-folding and heated outside mirrors
Interior, Comfort & Technology
Premium leather-appointed seating with AT4 embroidery
Heated and ventilated front bucket seats
Heated rear outboard seats
Dual-zone automatic climate control
10-way power driver and passenger seats with memory
8-inch GMC Infotainment System touchscreen
Wireless Apple CarPlay® and Android Auto 
Bose premium sound system
Wireless phone charging
Rear seat storage compartments and folding rear bench
Remote start and keyless open/start
Safety & Driver Assistance
HD Rear Vision Camera
Front and rear park assist
Lane Change Alert with Side Blind Zone Alert
Rear Cross Traffic Alert
Forward Collision Alert and Automatic Emergency Braking
Lane Keep Assist with Lane Departure Warning
IntelliBeam automatic high beams
Tire Pressure Monitoring System with Tire Fill Alert
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