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What Does AT4 Mean On GMC Trucks? Here's What The Package Includes
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 ...
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Review - 2020 GMC Sierra AT4 Duramax
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 ...