The Sierra 2019 from GMC goes into premiere on Monday of the very first Sierra AT4. The AT4 is the first in a new sub-brand of GMC Offroad, which will be available for each vehicle in the model range over the next two years.

The first Sierra built to leave the pavement features a 2-inch factory-installed suspension lift, all-terrain Rancho monotube shocks, and 18-inch wheels with all-terrain tires. The AT4 comes standard with the 5.3-liter V8 engine and offers options for new versions of the 6.2-liter V-8 and the Duramax 3.0-liter straight-six turbo diesel

two-wheel drive with two-speed Divider transmission, the AT4 also has downhill control and a Traction Select system that allows the driver to select from preset driving modes for different terrain and weather conditions. The Sierra AT4 also comes with a multi-color head-up display, surround-vision, which provides a bird's-eye view of tight maneuvers, and a rearview mirror of the camera.

The AT4, which debuted before the New York International Auto Show on Monday, is a darker, more dominant cousin of the 2019 Sierra Denali, which was unveiled in Detroit earlier this month. The off-road trim features accent details such as LED fog lights and black-chrome fender trims, highlighted by red towing hooks.

The interior of the Sierra AT4 is also darker with toned and textured aluminum surfaces on the steering wheel, center stacks and door sills. The black leather seats are offset by brown highlights and stitching.

"The Sierra of 2019 is the bravest expression GMC has ever developed for the full-size pickup, and the new AT4 underscores its ability with distinctive, athletic elements," said Matt Noone , Design Director at GMC A statement.

The all-terrain Sierra comes standard with an industry's first mini tailgate to be used in the larger tailgate to facilitate access and loading. Optional is the lightweight carbon fiber bed debuting on the 2019 Sierra for the first time, and its premium Denali equipment will also be available in the all-terrain Sierra.

The AT4 will hit the market this fall, as does the 2019 Sierra standard and its higher-end Denali equipment. The new GMC pickups follow the debut of mainstream brother Chevrolet Silverado at the Detroit auto show in January.

The standard Sierra reflects the Silverado's commitment to a cast-iron bed, despite the much acclaimed Ford F-150 aluminum. Along with Chevy, GMC offers the largest box in the segment – increasing width by 7 inches and length by 1 inch over the current truck.

The AT4 package echoed Chevrolet's off-road offering on the Colorado with the ZR2 appearing at the Los Angeles Auto Show in 2016. But the Colorado is also built to impress on the road, developed by Chevy's performance team.

NNaughton@deoitnews.com

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