The 2019 GMC Sierra 1500 AT4 set to debut at the New York auto show this week is in "beast mode" right from the factory. The Sierra AT4 is basically GMC's version of the Chevrolet Silverado Trailboss, which means it features a two-inch suspension lift, plus a host of off-road goodies such as a two-speed transfer case, locking rear differential...
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