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Pack of GMC Sierra AT4s await sprint up Otay Mountain.
James M. Amend
GMC trail boss Nick Richards conducts driver briefing ahead of climb.
James M. Amend
GMC Sierra AT4 along the the trail.
James M. Amend
GMC Sierra AT4 atop summit.
James M. Amend
GMC Sierra AT4 atop summit overlooking San Diego, Pacific Ocean.
James M. Amend
GMC Sierra AT4 navigates rock pad.
James M. Amend
GMC Sierra AT4 receives standard off-road tuned Rancho monotube shocks.
Steve Fecht
GMC Sierra AT4 boasts 2-in. factory lift, skid plates.
Steve Fecht
GMC Sierra AT4 relies on Goodyear Wrangler Duratrac tires for grip.
Steve Fecht
GMC Sierra AT4 Traction Select System allows drivers to choose mode.
Steve Fecht
GMC Sierra AT4 contains Hill Decent Control option for safe, smooth drive down steep grades.
Steve Fecht
GMC Sierra AT4 4-wheel-drive system includes 2-speed transfer case.
Steve Fecht
Locking rear differential gives GMC Sierra AT4 superb traction.
Steve Fecht
GMC Sierra AT4 arrives amid truck-hungry market.
Steve Fecht
GMC Sierra AT4 $66,465 as tested.
Steve Fecht
GMC Sierra AT4 available now at U.S. dealerships.
Steve Fecht