GMC redefines the off-roading with the all-new 2019 Sierra AT4. The Sierra AT4 delivers a unique formula of authentic off-road capability and innovative technology paired with premium refinement and a bold appearance expected from GMC.

Sierra AT4 features new versions of the proven 6.2L and 5.3L V-8 engines along with all-new Duramax 3.0L inline-six turbo-diesel engine. The available 6.2L and 3.0L engines are paired with a 10-speed automatic transmission.

The 5.3L and 6.2L engines feature stop/start technology and new Dynamic Fuel Management that enables the engine to operate on one to eight cylinders, depending on demand, to optimize power and efficiency.

The all-new Sierra AT4 also comes standard with the industry-first MultiPro Tailgate -- the segment's most innovative tailgate ever. The MultiPro Tailgate features six unique functions and positions, offering enhanced second-tier loading and load-stop solutions, a standing workstation mode and easier access to items in the box.

Sierra AT4 comes standard with a factory installed 2-inch suspension lift that provides additional ground clearance and four-wheel drive with a two-speed transfer case that includes low-range four-wheel-drive gearing for extremely tough conditions.

Sierra AT4 includes off-road tuned Rancho monotube shock absorbers, a locking rear differential and Hill Descent Control, a driver assistance feature that leverages the anti-lock braking system to enable smooth, controlled descents on steep grades without the driver having to touch the brake pedal under certain conditions.

The Sierra AT4 has a unique look driven by dark exterior finishes and modern detailing. The interior also carries AT4-specific darkened trim, including dark-tinted and textured aluminum finishes on the steering wheel, center stack and sill plates, as well as a unique Jet Black/Kalahari color accents in the seats and live stitching.