First-ever Sierra Denali Ultimate and AT4X trims lead styling, interior and technology updates across lineup, including trailering-capable Super Cruise driver-assistance technology and new 13.4-inch-diagonal infotainment screen.

Sierra AT4X: the new peak in premium off-roading
The all-new Sierra AT4X continues GMC’s efforts to break ground in the premium truck category. The Sierra AT4X is a balanced execution that delivers advanced off-road capability when called upon without compromising the on-road comfort, tech, towing, and payload capability expected from a premium pickup.

Highlights include:

Standard 6.2L V-8 engine and 10-speed automatic transmission
Unique Multimatic DSSV spool-valve dampers
Unique springs that, with the Multimatic dampers, increase maximum front and rear suspension travel by 50 mm and 25 mm, respectively, compared with the standard AT4 suspension
Two-speed transfer case, with selectable modes for different off-road conditions — including Terrain Mode, which allows one-pedal3 rock crawling
Front and rear e-locking differentials, a combination not offered by any other competitor in its class
Specific off-road chassis and suspension calibrations
Unique, larger steel transfer case shield
18-inch black wheels with LT265/70R18 Goodyear Wrangler DuraTrac Mud-Terrain tires
Available rocker guard accessory

The functional features are complemented with a unique, luxury-focused AT4X Obsidian Rush interior that balances the off-roader’s capability with comfort and convenience. The cabin is awash with premium leather, including full-grain leather-wrapped and technical grain leather accents, all of which is highlighted with white piping and red stitching.

The interior also features authentic, dark Vanta ash wood trim, best-in-class 16-way power-adjustable and massaging front seats, a premium microsuede headliner, a 15-inch-diagonal Head-Up Display, power sliding rear window, power sunroof, a 12-speaker Bose® Premium Series audio system with Center Point technology and more.

AT4X’s payload capability is 1,420 pounds9 and its trailering rating is 8,900 pounds.

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