Heavy-duty off-roading at GMC had increased a notch with the first-ever Sierra 2500HD AT4X trim. And instead of stopping there, the automaker offers a special AEV Edition package on top of that with more steel, more badges, and a sterner appearance.
What sets the beefy AT4X apart from the standard Sierra HD? As with other AT4X models in GMC's lineup, this isn't an appearance package with badges and wheels. It sits an inch and a half higher thanks to a suspension lift. Multimatic DSSV dampers are plugged in, and it rides on 35-inch all-terrain tires. At the back is a new e-locking differential for the rear axle, while at the front, new upper and lower control arms are installed and connected to upgraded steering knuckles. And to keep things protected when venturing off the beaten path, a larger steel skid plate protects the transfer case. An aluminum skid plate is installed at the front.
