2025 GMC Sierra 2500 near Morganton, NC
The 2025 GMC Sierra 2500 HD delivers a combination of strength, advanced towing systems, and modern engineering. Built in multiple configurations with both gasoline and diesel engine options, it is designed to perform consistently in demanding environments. With updated safety features, a versatile chassis, and refined driveline engineering, the 2025 GMC Sierra 2500 HD is an option for drivers who require proven capability supported by precise specifications.
Suspension, Steering, and Braking Systems
The 2025 GMC Sierra 2500 HD is equipped with a short-long arm independent front suspension supported by torsion bars. At the rear, two-stage semi-elliptic multi-leaf springs are standard, while a three-stage version is available when paired with the Max Towing Package. Steering is controlled by a hydraulic power-assisted recirculating ball system, with Digital Variable Steering Assist available on SLT, AT4, Denali, and Denali Ultimate trims.
Braking performance is managed by a hydraulic power-assisted Hydroboost system. Four-wheel disc brakes with ABS and Stabilitrak electronic stability control provide consistency. Rotor dimensions include 14 x 1.6-inch front rotors across 2500 and 3500 models, with 14.1 x 1.3-inch rear rotors for single rear wheel models and 14 x 1.6-inch rear rotors for dual rear wheel models.
Technology Integration
The 2025 GMC Sierra 2500 HD introduces expanded availability of driver-assist systems. Adaptive Cruise Control with Trailering is now standard on AT4 and Denali trims, joining Denali Ultimate and SLT to cover most sales volume. The Sierra HD Pro Safety Plus Package now includes Front and Rear Park Assist, and these systems are also available on Pro and SLE trims. A Trailer Brake Controller is standard across every configuration. Stabilitrak stability control is also integrated to enhance trailer sway management and maintain handling confidence.
Engine Configurations and Output
The 2025 GMC Sierra 2500 HD provides two engine choices designed for efficiency and strength. The 6.6-liter V8 gasoline engine operates with a cast-iron block, aluminum heads, and direct fuel injection. It produces 401 horsepower at 5200 rpm and 464 lb-ft of torque at 4000 rpm. A compression ratio of 10.8:1 combined with overhead-valve architecture and variable valve timing supports controlled combustion and power delivery.
The available 6.6-liter Duramax® Turbo-Diesel V8 expands performance potential with 470 horsepower at 2800 rpm and 975 lb-ft of torque at 1600 rpm. A cast-iron block and aluminum cylinder heads are matched with common-rail direct injection and a 16.0:1 compression ratio.
Transmission and Driveline Engineering
Each engine is paired with the Allison® 10L1000 10-speed automatic transmission. The system delivers gear ratios ranging from 4.54 in first gear to 0.63 in tenth gear, with a reverse ratio of 4.54. The wide spread allows smooth operation in both low-speed hauling and high-speed cruising. Final drive ratios vary by engine selection, with a 3.73 ratio for gasoline models and a 3.42 ratio for diesel models.
Dimensions and Exterior Measurements
The 2025 GMC Sierra 2500 HD is offered in Regular Cab, Double Cab, and Crew Cab layouts, each available with standard or long bed lengths. Wheelbase measurements extend from 141.55 inches on the Regular Cab long bed to 172 inches on the Crew Cab long bed. Overall length varies between 236.6 inches and 266.77 inches depending on configuration. Width ranges from 81.75 inches on single rear wheel models to 96.75 inches on dual rear wheel models.
Height also varies slightly by trim and configuration, with standard models measuring about 79.9 inches and Denali trims reaching 80.9 inches. Ground clearance averages 10.1 inches on the 2025 GMC Sierra 2500 HD, with minor differences across trims. Wheel options include 17-inch steel, 18-inch steel or aluminum, 20-inch aluminum, and available 22-inch aluminum wheels, paired with heavy-duty tire sizes engineered for stability and load support.
Interior Dimensions and Occupant Space
Cabin measurements ensure that the 2025 GMC Sierra 2500 HD provides utility without reducing comfort. Headroom measures 43.1 inches in front, with rear seating headroom of about 40 inches in Double Cab and Crew Cab models. Legroom extends to 44.5 inches in the front row and up to 43.4 inches in the Crew Cab rear row. Shoulder room is approximately 66 inches in the front and 65 inches in the rear of Crew Cab trims. Hip room averages 61 inches in front and just over 60 inches in rear seating positions.
Base Curb Weight and GVWR
The base curb weight of the 2025 GMC Sierra 2500 HD varies by cab, drivetrain, and engine. Regular Cab 2WD models weigh from 6203 pounds with gasoline power to 6825 pounds with diesel. Crew Cab long bed 4WD models reach over 7700 pounds with diesel.
Gross Vehicle Weight Ratings (GVWR) reflect the engineering strength of the platform. For the 2025 GMC Sierra 2500 HD, GVWR begins at 10,000 pounds on 2WD gasoline models and extends to 11,350 pounds on diesel-powered Crew Cab 4WD models. These figures include the weight of the truck, occupants, cargo, and equipment when properly configured.
Payload Ratings
Payload capacities also vary across configurations. The 2025 GMC Sierra 2500 HD supports loads up to 3,759 pounds on 2WD gasoline Regular Cab models, while diesel versions carry just under 3,700 pounds. In Crew Cab 4WD layouts, payload ranges between 3,407 pounds and 3,576 pounds depending on engine type and bed length. Each figure is engineered in compliance with SAE standards and reflects the balance between curb weight and GVWR.
Towing Strength and Capabilities
The 2025 GMC Sierra 2500 HD is designed for towing heavy loads with controlled performance. Conventional towing ratings reach up to 20,000 pounds for diesel Crew Cab models equipped with the NHT package. Gasoline-powered versions support up to 16,000 pounds depending on configuration.
For fifth-wheel and gooseneck towing, diesel-powered Crew Cab long bed models achieve a maximum capacity of 21,900 pounds with the NHT package. Gasoline models are rated at 18,500 pounds in similar configurations. All towing ratings are certified under SAE J2807 standards to ensure accuracy and comparability.
Fuel Tank Capacity
Fuel tank sizes are designed for extended operating ranges. Regular Cab models feature a 36-gallon tank for gasoline and a 28-gallon tank for diesel. Double Cab trucks are available with a 36-gallon gasoline tank and either a 29.4-gallon diesel tank for standard beds or a 36-gallon tank for long beds. Crew Cab versions include 36-gallon tanks for both gasoline and diesel models.
Safety Engineering
The 2025 GMC Sierra 2500 HD prioritizes structural stability and advanced control systems. The Hydroboost braking system provides consistent stopping power even under heavy loads. Four-wheel ABS disc brakes are matched with stability control and trailer sway control to maintain safe operation in demanding towing conditions. Combined with expanded driver assistance technologies, the truck provides comprehensive support across a wide range of driving scenarios.
Visit Elevation Chevrolet GMC near Morganton, NC
The 2025 GMC Sierra 2500 HD combines precise engineering with advanced towing and hauling capacity. With engine options that deliver up to 975 lb-ft of torque, a 10-speed Allison® transmission that adapts to varied demands, and technologies that improve both safety and convenience, this model is prepared for any challenge. At Elevation Chevrolet GMC near Morganton, NC, we invite drivers to schedule a test drive and experience how it performs across work-ready applications. From its powerful driveline to its integrated safety systems, this heavy-duty truck is designed to meet demanding expectations. Visit us to see the full capabilities in action and confirm how the 2025 GMC Sierra 2500 HD can support your needs.