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The AT4 package makes the 2019 GMC Sierra better equipped for going off-road.
Changes include a 2-inch suspension lift, new shock absorbers and mud-terrain tires.
The Sierra AT4 also features an Eaton G80 self-locking rear differential for extra traction.
The AT4 comes standard with a 5.3-liter V8, which is rated for 355 horsepower and 385 pound-feet of torque. Buyers can upgrade to a 6.2-liter V8 with 420 hp and 460 lb-ft.
The AT4 also can be equipped with a color HUD display with special off-road info displays and a 360-degree camera system.
In addition, the Sierra AT4 is offered with the truck's innovative MultiPro tailgate.
Other tweaks for the Sierra AT4 include dark-finish exterior trim, a body-color grille and bumper, vertical-oriented red recovery hooks, "Kalahari" seat inserts and rubber floor mats.
An 8-inch touchscreen infotainment system features Apple CarPlay and Android Auto. My test vehicle also features wireless phone charging and built-in navigation.
The 2019 GMC Sierra AT4 starts at $53,200 before destination or options. My test truck cost $65,475.
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