Lucas Scarfone Photography

OC tests the new GMC Sierra AT4 (at the Calgary Stampede!)

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Lucas Scarfone Photography

Then it was time to get these bad boys dirty. An off-road track allows us to put the 2019 Sierra AT4s to the test—up, down and all-around. The two-inch factory-installed suspension lift, and hill-descent control feature make these sloppy hills a breeze—you never feel like you’re losing control.