Expanding its All Terrain X models, GMC announced today that the Duramax-powered Sierra HD will be offered for 2017. The Sierra HD All Terrain X will join the Canyon and Sierra 1500 this fall as the third model in the All Terrain X series (see our test of the Duramax Canyon in the ’16 Mid-Size Shootout).

The Sierra 2500HD crew cab 4WD with be available with either a 6L V8 gasoline engine or the all-new next-gen Duramax 6.6L V-8 turbo-diesel, which is rated to produce 445 hpand an SAE-certified 910 lb.-ft. of torque.

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“The new Sierra HD All Terrain X’s powerful attitude reflects a popular trend in very capable off-road trucks, executed with a range-topping level of refinement — a combination of attributes GMC has cultivated for years,” said Duncan Aldred, vice president of GMC Sales and Marketing. “And with the new, available Duramax 6.6L, this truck more than matches its bold good looks with true professional-grade capability.”

The All Terrain X offers unique features that includes 18-inch black-painted aluminum wheels fitted with more aggressive LT275/65R18 Goodyear Duratrac MT-rated tires; a unique body-color grille surround with All Terrain insert; body-color door handles and bodyside moldings; black power-adjustable heated and power-folding trailering mirrors with integrated turn signals, LED rear guidance lamps and LED amber clearance lamps; black belt moldings, front bumper skidplate and B-pillars; 4-inch black sport side steps; and black sport bar (mounted in the bed) designed to support available GMC Accessories LED off-road driving lamps.

Other All Terrain features include a spray-on bedliner, Front and Rear Park Assist, the Z71 off-road suspension package, underbody shield, heated steering wheel and all-weather floor liners. For added off-road traction, GMC includes an Eaton automatic locking rear differential. GMC says the Sierra HD All Terrain X series offered in Black Onyx and Summit White.