2025 GMC Sierra HD

The 2025 GMC Sierra HD, available as both the 2500 HD and 3500 HD, offers a comprehensive range of trims to match every driver’s purpose and preference. The Pro model forms a strong foundation, emphasizing durability and function with a bold grille and muscular stance. Stepping up, the SLE adds refinement through upgraded tech and enhanced convenience. The SLT introduces even more sophistication, with premium exterior detailing and advanced trailering features ideal for drivers seeking everyday usability with upscale appeal. For off-road enthusiasts, the AT4 trim brings capability and attitude—featuring skid plates, and aggressive off-road tires. The new AT4X takes adventure further with a 1.5-inch factory lift, Multimatic DSSV™ dampers, and rear electronic-locking differential for ultimate off-road control. On the luxury end, the Denali trim elevates design and presence with its signature chrome grille, premium wheels, and distinctive LED lighting. At the top sits the Denali Ultimate, distinguished by exclusive Vader Chrome exterior trim, 20-inch Ultra-Bright machined aluminum wheels, and power-assist steps. Inside, it’s finished in Alpine Umber leather and open-pore Paldao wood—turning heavy-duty performance into a refined art form.

Every 2025 Sierra HD delivers commanding power tailored to your needs. The standard 6.6L V8 gas engine produces 401 hp and 464 lbs.-ft. of torque, offering consistent strength for hauling, towing, and daily tasks. For those demanding even greater performance, the available 6.6L Duramax® Turbo-Diesel V8 generates 470 hp and a staggering 975 lbs.-ft. of torque, paired with a 10-speed Allison® automatic transmission for seamless power delivery and exceptional towing control.

Engineered for durability and precision, the 2025 GMC Sierra HD delivers professional-grade capability at every turn. When properly equipped, the Sierra 3500 HD can tow up to 36,000 pounds. Whether navigating tight city corners or open interstates, the truck’s refined suspension system delivers smooth, stable control. The AT4 and AT4X trims add off-road-specific tuning, ensuring strength and sophistication go hand in hand.

Inside, the 2025 Sierra HD combines rugged functionality with modern luxury. Spacious seating and high-quality materials create an environment built for comfort during long hauls or demanding workdays. The Denali Ultimate trim is the definition of refinement, featuring full-grain leather seating, laser-etched topographic detailing of Mount Denali, and massaging front seats that make even the longest drives feel effortless. Technology takes center stage with a 13.4-inch diagonal infotainment touchscreen and a 12.3-inch digital driver display, both standard on upper trims. Ample storage, smart console organization, and intuitive controls make the cabin as practical as it is polished.

Safety is integral to every 2025 GMC Sierra HD. The standard safety suite includes Automatic Emergency Braking, Forward Collision Alert, Lane Departure Warning, Front Pedestrian Braking, Following Distance Indicator, and IntelliBeam® auto high beams. For added confidence, available GMC Pro Safety Plus expands protection with Rear Cross Traffic Braking, Blind Zone Steering Assist, and HD Surround Vision for a 360° view around the truck.