Experience unmatched capability and refined comfort in the 2026 GMC Sierra 2500HD AT4, designed for those who demand power and precision in every drive.

Built to conquer the toughest tasks, the Sierra 2500HD AT4 boasts a robust turbocharged 8-cylinder diesel engine paired with a smooth 10-speed automatic transmission and a 4x4 drivetrain. Whether hauling heavy loads or navigating rugged terrain, its locking limited-slip differential and advanced traction control provide confident handling in all conditions. The integrated tailgate step and bed liner enhance utility, making loading and unloading effortless. Inside, the crew cab offers premium leather bucket seats with heating, cooling, and adjustable lumbar support for both driver and passenger, ensuring comfort on long hauls. Seat memory and power adjustments tailor your seating position perfectly every time. Safety is paramount with features like automatic high beams, blind spot monitoring, lane departure warning, and front collision mitigation, all designed to keep you secure on the road. Advanced technology includes an aerial view display system, adaptive cruise control, and a navigation system, providing convenience and situational awareness. Heated mirrors, running boards, and aluminum wheels add to the truck’s rugged yet refined presence. With a $5,000 cash rebate, the 2026 GMC Sierra 2500HD AT4 in striking Onyx Black is ready to take on your toughest jobs with Canadian winters in mind.