The 2025 GMC Sierra 2500HD AT4 is a heavy-duty pickup truck that offers a unique blend of capability and refinement. It is powered by a 6.6-liter Duramax diesel engine that produces 445 horsepower and 910 lb-ft of torque. This engine is paired with a 10-speed Allison transmission that provides smooth and efficient shifting. The Sierra 2500HD AT4 also features a number of off-road upgrades, including a lifted suspension, all-terrain tires, and a locking rear differential.
The Sierra 2500HD AT4 is a versatile truck that is well-suited for a variety of tasks. It can be used for towing and hauling, as well as for off-road adventures. It is also a comfortable and well-equipped truck that is perfect for everyday driving.