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What Does AT4 Mean On GMC Trucks? Here's What The Package IncludesThe Sierra AT4 has a standard 3.0L Duramax Turbo Diesel engine with Active Thermal Management for a range of environmental conditions, to push out 305 horsepower with 495 lb-ft of torque.
2020 GMC Sierra AT4 Duramax First Drive: Less Greedy, Still Muscled The 2020 GMC Sierra AT4 Duramax is proof that t... New 2020 Chevrolet Silverado HD First Drive: 35,500 Reasons to Consider it ...
2020 GMC Sierra AT4 Duramax First Drive: Less Greedy, Still Muscled The 2020 GMC Sierra AT4 Duramax is proof that t... New 2020 Chevrolet Silverado HD First Drive: 35,500 Reasons to Consider it ...
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