The 2025 GMC Sierra 2500HD AT4 offers a commanding fusion of heavy-duty capability and premium off-road readiness, finished in a clean Summit White exterior. Powered by the legendary Duramax® 6.6L V8 turbodiesel engine delivering 470 horsepower and 975 lb-ft of torque, this powerful workhorse provides exceptional towing and payload performance through its heavy-duty Allison® 10-speed automatic transmission and a robust 2-speed Autotrac® 4WD system with an auto-locking rear differential for unwavering traction in the most demanding conditions .

The purpose-built AT4 trim outfits the Sierra with aggressive 20-inch high-gloss black aluminum wheels wrapped in all-terrain tires, distinctive AT4 badging with red recovery hooks, and a rugged off-road suspension . Inside, you'll find premium leather-appointed seating surfaces with heated and ventilated front seats and AT4 embroidery, a leather-wrapped heated steering wheel, and durable interior accents with premium floor liners. The spacious Crew Cab offers best-in-class comfort, along with dual-zone automatic climate control and a premium Bose® audio system with a 13.4-inch touchscreen .

Advanced technology features include the GMC Premium Infotainment System with Google built-in, wireless Apple CarPlay® and Android Auto™ integration, and a 4G LTE Wi-Fi hotspot . The Sierra 2500HD AT4 also boasts standard underbody skid plates, a spray-on bedliner with the GMC MultiPro® tailgate, and GMC Pro Safety Plus including HD Surround Vision and Trailer Side Blind Zone Alert for ultimate control, confidence, and capability on any terrain .

Engineered for those who demand maximum capability with off-road toughness, this Sierra 2500HD delivers a substantial 18,500 pounds of maximum towing capacity and a 3,395-pound payload when properly equipped, representing the premium choice for heavy-duty truck performance .

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