The 2020 GMC Sierra HD AT4 has an all-wheel drive mode called “Auto 4WD” to complement the traditional, 2WD, 4WD High and 4WD Low modes. The 2020 GMC Sierra HD AT4 has an all-wheel drive mode called ...
Editor’s note: This article was last updated on Nov. 30, 2019. It has been reviewed by Cars.com Senior News Editor Jennifer Harrington and is still accurate. The term 4×4 means a four-wheel-drive ...
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