The 2025 GMC Sierra 2500HD AT4X is a heavy-duty pickup truck manufactured by GMC, a division of General Motors. It is the most capable and off-road-oriented variant of the Sierra 2500HD lineup, designed for extreme terrains and challenging driving conditions.
The 2025 Sierra 2500HD AT4X boasts impressive features, including a high-performance 6.6L Duramax turbodiesel V8 engine, delivering up to 470 horsepower and a staggering 975 lb-ft of torque. It comes equipped with a 10-speed Allison transmission, providing smooth and efficient gear changes. The truck’s off-road prowess is enhanced by its advanced four-wheel drive system with an electronic locking rear differential, allowing it to tackle rugged terrains with confidence.