2025 GMC Sierra 2500 AT4

The 2025 Sierra 2500 is GMC's heavy-duty pickup, built for serious towing and hauling duty with a choice of work-oriented and luxury trims. It competes head-to-head with the Ford F-250 Super Duty and Ram 2500 in the heavy-duty segment. Despite its size, the Sierra 2500 steers with surprising precision, and the diesel pulls hard when you need it. The ride is firm when unladen, which is the price of its payload capacity, but the cabin stays quiet and composed on the highway. Inside, the Sierra 2500 offers a spacious crew cab with a large infotainment screen, and the Denali trims add premium materials and a luxurious feel. Stepping up from the SLT to the AT4 adds an off-road suspension with Rancho shocks, skid plates, and a two-speed transfer case, turning the Sierra into a trail-ready heavy-duty truck. The standard 6.6L V8 makes 401 horsepower and 464 lb-ft of torque, paired with a ten-speed automatic and four-wheel drive, which gives it strong pulling power for heavy trailers. The AT4's X31 Off-Road Package is standard here, so you get the hill descent control and underbody protection without checking any option boxes.