2026 GMC Sierra Sierra AT4 vs AT4X: Which Off-Road Trim Wins? By Ryan Green, Marketing Director — Weld County Garage GMC  |  Updated April 2026 $12,100 Price gap (1500) 35″ AT4X HD tires 2 Lockers (1500 AT4X) 11.6″ AT4X HD ground clearance Walk into Weld County Garage looking for an off-road Sierra and you’ll see…

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