GMC debuted the new Sierra at the Detroit Auto Show featuring its new tailgate and carbon-fiber bed. But the 2019 GMC Sierra AT4 is the first introduction from the automaker’s all-new sub-brand.
AT4 stands for All Terrain 4 and for enhancing off-road abilities without having to give up premium features and technology. The AT4 is different from the Denali and SLT Sierra with a 2-inch lift, locking rear differential, off-road tires, and a 5.3-liter V8 under the hood. So, if you want to hit the trails but still have leather seats, the AT4 lineup might be your thing.
Source: The Drive