Experience unmatched capability and refined comfort with the 2026 GMC Sierra 3500HD AT4, designed for those who demand power, precision, and advanced technology in every drive.

Built to conquer the toughest jobs, the Sierra 3500HD AT4 features 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 tow hooks provide superior traction and control. The integrated tailgate step and power retractable running boards ensure effortless access to the bed, which comes protected with a durable liner for added resilience.

Inside the crew cab, drivers will appreciate premium leather bucket seats with heating, cooling, and adjustable lumbar support, complemented by seat memory for personalized comfort. Advanced safety technologies such as blind spot monitoring, front collision mitigation, lane departure warning, and an aerial view display system enhance confidence on every journey. The adaptive cruise control and navigation system make long hauls more manageable, while the heated steering wheel and mirrors add convenience in colder Canadian climates.

With aluminum wheels, LED headlights, and privacy glass, the Sierra 3500HD AT4 combines rugged durability with a commanding presence, making it the ideal truck for professionals who require strength without sacrificing sophistication.