The 2025 GMC Sierra 2500HD Denali is a heavy-duty pickup truck manufactured by GMC. It is the top-of-the-line model in the Sierra 2500HD lineup and offers a combination of power, capability, and luxury.
The Sierra 2500HD Denali is powered by a 6.6-liter Duramax turbodiesel V8 engine that produces 445 horsepower and 910 lb-ft of torque. It comes standard with a 10-speed Allison automatic transmission and four-wheel drive. The truck has a maximum towing capacity of 36,000 pounds and a maximum payload capacity of 7,442 pounds.