2026 GMC Sierra 2500HD AT4

Experience the power and capability of the 2026 GMC Sierra 2500HD AT4 Crew Cab, designed for demanding work and rugged adventures with advanced towing and premium comfort.

This new 2026 GMC Sierra 2500HD AT4 is equipped with a robust 6.6L V8 engine delivering 401 horsepower and 464 lb-ft of torque, paired with a 10-speed automatic transmission and four-wheel drive for confident handling on any terrain. The truck features a crew cab with seating for five, including heated and cooled front bucket seats with adjustable lumbar support and memory settings, ensuring comfort during long hauls. The AT4 Premium Plus Package adds a power sunroof, advanced technology, and a high-clearance step for easier access.

Towing is made effortless with the Gooseneck/5th Wheel Prep Package, featuring a hitch platform and bed-mounted 7-pin trailer harness, ready for heavy-duty trailers. Safety is comprehensive with automatic high beams, blind spot monitoring, lane departure warning, front collision mitigation, and more. The exterior is ruggedly equipped with running boards, integrated tailgate step, bed liner, and off-road tires on aluminum wheels. Additional convenience comes from remote engine start, keyless entry, power folding heated mirrors with memory, and an aerial view display system to assist in tight spots. This Sierra 2500HD AT4 is built to handle tough jobs with confidence and style.