New trim level available this summer.
Blending style, tech and ruggedness, GMC's new All Terrain package has been revealed for the Sierra 2500HD and 3500HD. The package is specifically for the double cab and crew cab models equipped with four-wheel drive. Distinguishing exterior upgrades include a chrome grille surround, aluminum "underbody shields," 18-inch cast-aluminum wheels, special badging, body-color bumpers, LED-infused headlights and chrome mirror caps.
Inside, a "carbon-fiber inspired" cabin features special door sills, an IntelliLink infotainment system and rearview camera, while the Z71 off-road package comes as standard, consisting of Rancho twin-tube shocks, hill descent control and a skid plate. Offered on both the SLE or SLT trims, power comes from either a 360-hp 6.0-liter V8 or a 397-hp 6.6-liter diesel V8, both mated to six-speed automatics. The Sierra All Terrain HDs go on sale this summer.