1. Powerful Diesel Powertrain & Transmission
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- Core Engine: Equipped with the renowned 6.6L Duramax Turbo-Diesel V8 engine.
- Performance Specs: It delivers a maximum of 470 horsepower and a massive 975 lb-ft of torque. This enables the truck to rocket from 0 to 60 mph in just around 7.1 seconds.
- Transmission: Mated to the highly acclaimed Allison 10-speed automatic transmission, providing smooth gear shifts that perfectly unleash the low-end, high-torque characteristics of the diesel engine.
- Independent Front Suspension: Unlike the solid front axles found on the Ford Super Duty or Ram HD, GMC relies on an independent front suspension with torsion bars. This delivers noticeably better handling and ride comfort on both bumpy roads and paved highways.
2. Premium Hardcore Off-Road Features
As the flagship off-road series in the GMC lineup, the AT4X gives this heavy-duty truck exceptional capability:
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- Multimatic DSSV Dampers: These top-tier spool-valve shock absorbers from GM effortlessly balance daily on-road comfort with heavy impact absorption during extreme off-roading.
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- Factory Lift: Comes standard with a 1.5-inch suspension lift, significantly increasing ground clearance (reaching up to 11.3 or 11.6 inches depending on the version).
- Tires & Locker: Features standard 18-inch wheels wrapped in 35-inch Goodyear Wrangler Territory MT mud-terrain tires, paired with an electronic locking rear differential for getting out of tough spots.
- Underbody Protection: Outfitted with large steel skid plates to protect vital components, including the fuel tank, transfer case, and engine oil pan.
3. Towing & Hauling Capability
Despite being an off-road-focused model, it maintains incredible heavy-duty utility:
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- Max Towing Capacity: Offers a conventional towing capacity of up to 18,500 lbs using a standard hitch.
- Bed Practicality: Features GMC’s signature MultiPro 6-function tailgate (which converts into a step, workbench, or load stop), a 120V power outlet in the bed, and a factory spray-on bedliner.
- Towing Tech: Equipped with up to 14 camera views, including the “Transparent Trailer” feature, which allows you to virtually “see through” your trailer on the center screen, greatly reducing the stress of long-haul towing.
4. “Denali-Class” Luxury Cabin
The AT4X interior matches the luxury of GMC’s famous flagship Denali series, completely shedding the rugged look of traditional work trucks:
- Premium Materials: Completely wrapped in premium leather, featuring seats with contrast stitching and piping, along with a sleek suede headliner.
- First-Class Experience: The front seats support heating and ventilation, and come fully loaded with a massage function and 16-way power adjustments.
- Tech Layout: Features a 12.3-inch digital driver information center and a 13.4-inch center touchscreen (with Google built-in, wireless Apple CarPlay, and Android Auto), complemented by a massive Head-Up Display (HUD) and a 12-speaker Bose premium sound system.
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