When you want to go off-road, uptown-style, GMC supports that vision with ... and more. The Sierra AT4 has a standard 3.0L Duramax Turbo Diesel engine with Active Thermal Management for a range ...

This particular truck brings a whole lot of GMC’s latest along with it. First, it’s GMC’s new AT4 trim that tries to marry Denali ... Lastly, this one’s a new 3.0L inline-six Duramax diesel married to ...

The Sierra EV AT4 will feature coil-spring suspension and 35-inch all-terrain tires, a combination that adds two inches of ground clearance, as well as GMC's Terrain mode for optimized electric ...