Experience unmatched capability and refined comfort with the 2026 GMC Sierra 2500HD AT4, designed for those who demand power, precision, 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 and 4x4 drivetrain, delivering exceptional towing and hauling performance. Its locking limited-slip differential enhances traction on challenging terrains, ensuring confidence whether on rugged trails or work sites. The integrated tailgate step and bed liner provide practical solutions for loading and unloading heavy gear, while running boards offer easy access to the spacious crew cab.

Inside, this truck combines rugged durability with premium comfort. Heated and cooled leather bucket seats with power adjustments and memory settings keep you comfortable on long hauls, while the multi-zone climate control caters to every passenger’s needs. Advanced safety features such as blind spot monitoring, lane departure warning, front collision mitigation, and an aerial view display system provide peace of mind in all conditions. Additional conveniences like remote engine start, keyless entry, and a premium sound system with smart device integration make every journey efficient and enjoyable. The Summit White exterior complements the AT4’s bold stance, making a statement wherever the road takes you.