2021 GMC Sierra 2500HD AT4

The Sierra 2500HD AT4 is built on a foundation of heavy-duty engineering designed to handle demanding work and challenging terrain. The Duramax diesel engine delivers the torque and power needed for towing and hauling, while the 10-speed transmission provides refined shifts and efficiency across diverse driving conditions.

The 4WD system with active transfer case and off-road suspension package gives you genuine capability whether you're navigating job sites or rough terrain.

Inside, the cab reflects a commitment to driver comfort and modern convenience. Heated and ventilated front seats with lumbar support, dual-zone automatic climate control, and a heated steering wheel address the demands of extended time behind the wheel.

The premium infotainment system keeps you connected through wireless phone projection and satellite radio, while steering wheel audio controls allow you to manage functions without taking your hands off the wheel.

The AT4 package distinguishes this truck with functional design elements that serve real purposes. Red recovery hooks, a spray-on bed liner bearing the AT4 logo, a winter grille cover, and painted black surround details combine practical utility with purposeful styling. The bed includes 120-volt and 12-volt auxiliary power outlets for tool charging and equipment operation at the job site.

Safety systems are comprehensive, including electronic stability control, traction control, brake assist, dual front airbags with side-impact protection, and a backup camera with hitch guidance. The abundance of storage—driver and passenger vanity mirrors, door bins, overhead console, and multiple power outlets—supports organized truck living.

With 98,952 miles on the odometer, this Sierra 2500HD carries the benefit of real-world durability testing while retaining substantial remaining service life typical of heavy-duty construction.