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The Sierra All Terrain X is an extension of GMC's All Terrain package, itself an extension of the Sierra 1500 4WD SLT Crew Cab/Short Box configuration.

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The standard All Terrain package includes 4WD with an Eaton locking differential, off-road suspension, an in-dash inclinometer, body-color bumpers, a spray-in bedliner and rear parking sensors.

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The "X" package adds black wheels with mud tires, black side steps, off-road LED lighting, LED headlights, a louder exhaust system, body-color door handles and numerous bits of blacked-out exterior trim pieces.

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While it looks especially mean in black, you can also order the All Terrain X in white, blue, light gray, gunmetal or red.

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The vehicle goes on sale this spring, but GMC has not yet released pricing.

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For reference's sake, a current Sierra All Terrain goes for about $50,000, so the All Terrain X will likely add a couple grand to that.

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When was the last time you saw a light bar on a new pickup? This has us nostalgic for Marty McFly's dream Toyota pickup from "Back to the Future."

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The All Terrain X will also apparently go through water, although we'd be flummoxed to find a truck that can't in this day and age.

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The Sierra's performance exhaust not only adds some grunt to the 6.2-liter V-8's exhaust note, it bumps the horsepower up to a nice and even 365 hp.

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The All Terrain X is a limited-edition model, so don't expect it to stick around for the duration of the Sierra's lifecycle.

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