The 2025 GMC Sierra AT4 HD is a heavy-duty pickup truck that’s designed for off-roading. It’s a part of the GMC Sierra lineup, which additionally consists of the 1500, 2500HD, and 3500HD fashions. The AT4 HD is offered in each crew cab and double cab configurations, and it comes with a wide range of options which might be designed to enhance its off-road efficiency, together with a lifted suspension, all-terrain tires, and a locking rear differential.
The 2025 GMC Sierra AT4 HD is powered by a 6.6-liter V8 engine that produces 401 horsepower and 464 lb-ft of torque. It’s mated to a six-speed automated transmission and four-wheel drive is customary. The AT4 HD has a most towing capability of 15,400 kilos and a most payload capability of three,270 kilos.