Since its introduction in 2022, the off-road-focused GMC Sierra 1500 AT4X has exclusively employed GM’s familiar 6.2-liter gasoline V-8. The AT4X model is now getting a welcomed powertrain addition ...

The days of diesel have already started to diminish. Diesel engines are more efficient than gasoline engines but produce more emissions, so they've been largely replaced or eliminated in many vehicles ...

The most extreme version of the Sierra 1500, the off-road-capable AT4X trim, will now be offered with a fuel-sipping 3.0-liter Duramax diesel engine. The torquey unit will come as standard on the 2024 ...

The 2024 GMC Sierra AT4X is getting an upgraded powerplant for the new model year. Where it once solely featured GM’s 6.2-liter V8 truck engine, it’s now set to offer Duramax diesel power as standard.

GMC’s off-road-focused AT4X lineup comes in three sizes: the heavy-duty Sierra HD is the largest, the mid-size Canyon is the smallest, and smack in the middle is the full-size, light-duty Sierra 1500.