Experience unmatched capability and rugged refinement with the 2026 GMC Sierra 2500HD AT4, designed for those who demand power, comfort, and advanced technology in every drive.

Built to conquer the toughest jobs, the Sierra 2500HD AT4 features a robust turbocharged 8-cylinder diesel engine paired with a smooth 10-speed automatic transmission, delivering impressive torque and towing capacity. Its 4x4 drivetrain with locking limited-slip differential ensures confident handling on challenging terrain, while integrated tow hooks and a durable bed liner make hauling and loading effortless. The crew cab offers spacious leather seating with heated and cooled front seats, heated rear seats, and adjustable lumbar support, providing exceptional comfort during long hauls or daily drives. Convenience is enhanced with power-adjustable seats featuring memory settings, power folding mirrors, and an integrated tailgate step for easy bed access. Safety is paramount with advanced features like blind spot monitoring, front collision mitigation, lane departure warning, and an aerial view display system that offers a comprehensive perspective around the truck. Stay connected and in control with adaptive cruise control, a premium sound system, navigation, and smart device integration, all accessible through intuitive steering wheel controls. Finished in Summit White with rugged aluminum wheels and running boards, the Sierra 2500HD AT4 stands ready to tackle work and adventure with confidence and style.