6.6L Duramax V8 Turbo-Diesel Engine (Highly Recommended): It pumps out an impressive 470 horsepower and a staggering 975 lb-ft (1,322 N·m) of torque! Engineered specifically for extreme heavy-duty tasks, this absolute beast of an engine effortlessly pulls tens of thousands of pounds uphill at low RPMs.
Transmission: The entire lineup comes standard with the legendary Allison® 10-speed automatic transmission.
Conventional Towing: Max towing capacity reaches up to 21,190 lbs (approx. 9.6 tons).
Fifth-Wheel / Gooseneck Towing: When equipped with the dedicated trailering package, the maximum towing capacity surges to 22,390 lbs (approx. 10.1 tons).
Maximum Payload: The truck bed can handle a maximum payload of over 3,500–4,000 lbs (approx. 1.6–1.8 tons).
Tailgate: It also features the iconic GMC MultiPro Tailgate with six unique functions as standard, making it incredibly convenient for hauling heavy tools, ATVs, or heavy motorcycles.
The interior completely sheds the rugged, bare-bones feel of traditional work trucks, opting instead for a tech-forward luxury layout:
Smart Dual Screens: Equipped with a 13.4-inch central touchscreen (with built-in Google ecosystem) and a 12.3-inch digital instrument cluster.
Exclusive Kalahari Interior: Jet Black leather seats are accented with AT4-exclusive Kalahari brown leather piping and embroidered stitching, exuding a subtle yet rugged luxury.
ProGrade 14-View Trailering System: Supports up to 14 camera views, including the innovative “Transparent Trailer View.” Even when towing a luxury yacht or a standard shipping container, it provides a clear view of what’s behind you, completely solving the backing-up headache typical of heavy-duty trucks.
Premium Comfort: Standard amenities include a Bose® 7-speaker premium audio system and heated and ventilated front seats.
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