GMC has complemented the Sierra HD truck family with a new AT4X version featuring chassis reinforcements and certain exterior modifications.
The suspension benefits from new arms and shocks and is lifted by 40 mm (1.6 inches) compared to stock. Also on the list are 35-inch off-road tires and a tuning kit from American Expedition Vehicles (AEV). The latter includes an original wheel set, robust new bumpers, advanced undercarriage protection and a winch.
By default, the AT4X spec ships with a rear diff lock and a dedicated “Off-road” driving mode included. For the engine, you can go with the petrol one rated at 407 PS (400 hp / 299 kW) or choose a high-end diesel and get 477 PS (470 hp / 351 kW).