The 2020 GMC Sierra 3500HD AT4 represents the pinnacle of heavy-duty off-road capability, combining the brand's most muscular truck platform with a distinctive rugged identity. Finished in Carbon Black Metallic, this AT4 is driven by dark chrome exterior finishes, body-color bumpers, and a bold black chrome grille set off by signature red vertical recovery hooks .

At its heart lies the legendary Duramax 6.6L turbo-diesel V8 engine, delivering an SAE-certified 445 horsepower and 910 lb-ft of torque. This immense power is channeled through the segment-first Allison 10-speed automatic transmission, paired with a capable 4WD system featuring an Auto 4WD mode for seamless traction on varying surfaces. The AT4's off-road prowess is rooted in a unique suspension with Rancho shocks, skid plates, and an Eaton locking rear differential, along with a Traction Select System featuring a dedicated Off-Road mode .

The athletic interior carries AT4-specific darkened trim, including dark-tinted and textured aluminum finishes on the steering wheel and center stack, paired with a unique Jet Black interior featuring Kalahari color accents and live stitching. Standard leather-appointed seating with mini-perforated inserts and embroidered AT4 badging on the headrests delivers durability with uncompromising comfort, alongside all-weather floor liners. The cabin also features a Head-Up Display with an Off-Road Inclinometer and HD Surround Vision for low-speed views of the vehicle's surroundings.

Advanced technology includes the GMC Infotainment System with an 8-inch touchscreen, navigation, Apple CarPlay and Android Auto capability, and a Bose premium seven-speaker audio system. The AT4 also boasts the segment-first MultiPro six-function tailgate, a 120-volt power outlet, and class-leading heavy-duty cargo bed volume with 12 corner tie-downs.

Engineered for those who demand maximum capability with off-road readiness, this Sierra 3500HD AT4 delivers a maximum trailering rating of up to 35,500 pounds when properly equipped with the diesel engine and gooseneck hitch. With its blend of Duramax diesel power, Allison transmission refinement, and rugged AT4 identity, it stands as a benchmark in the premium heavy-duty off-road truck segment.

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