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Two Sierras, two very different missions! We break down the AT4 and AT4X in terms of suspension, off-road capability, pricing, and more. The AT4 runs Rancho Monotube shocks and a locking rear diff.

When you want to go off-road, uptown-style, GMC supports that vision with a rugged line of trucks and SUVs packaged under the AT4 label, or All-Terrain 4WD. These mighty vehicles are off-road capable, ...

GMC’s heavy-duty luxury Sierra pickup resembles a Cadillac that has mated with a Caterpillar Mining Truck. That is, it’s huge, it’s heavy, it’s tall and it has enough off-roading doodads and gadgets ...

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