Shop 2019 GMC Sierra 1500 AT4 vehicles in Garden City, MI for sale at Cars.com. Research, compare, and save listings, or contact sellers directly from 1 2019 Sierra 1500 models in Garden City, MI.

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.

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