so we're not in the least bit surprised that a 2025 GMC Sierra HD AT4 is now posing like a model around a rock quarry. Unfortunately, we don't know many details about the exact specification of ...
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What Does AT4 Mean On GMC Trucks? Here's What The Package IncludesThese days, GMC offers six vehicles with the AT4 package: three SUVs and three pickups, including the Canyon, Sierra 1500, and Sierra HD (Heavy Duty). While each truck has its own flavor of AT4 ...
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