6 Tough Highlights of the 2025 GMC Sierra HD

The 2025 GMC Sierra HD lineup offers the strongest pickup trucks on the market. Both the 2500 and 3500 HD are built to tackle your most challenging jobs with ease and precision. Check out six of the toughest Sierra HD highlights below!

6 Tough Highlights of the 2025 GMC Sierra HD

1. 6.6L Engine Options

A 6.6L V8 gas engine comes standard on the GMC Sierra 2500 and 3500 HD, offering an incredible 401 horsepower at 5200 rpm and 464 lb-ft of torque at 4000 rpm. To get the most power out of your GMC Sierra HD, you can choose the available 6.6L Duramax turbo-diesel engine, which yields 470 horsepower at 2800 rpm and 975 lb-ft of torque at 1600 rpm. This engine provides a maximum towing capacity of 21,870 pounds on the 2500 and 36,000 pounds on the 3500.

2. Allison 10-Speed Automatic Transmission

Every GMC Sierra HD pickup comes with an electronically controlled Allison 10-speed automatic transmission with overdrive for the smoothest performance you can imagine. The Allison transmission provides better control and improved cooling when towing and hauling heavy loads, thanks to its tow/haul mode.

3. Trailering Package

The GMC Sierra HD is a popular choice for drivers who have frequent towing projects because it comes with a complete trailering package. The GMC trailering package includes the following features to enhance all of your trailering jobs:

• Trailer hitch
• Trailering hitch platform
• 2.5-inch receiver hitch
• 4-pin and 7-pin connectors
• 7-wire electrical harness
• 7-pin sealed connector

The GMC trailering package also comes with Hitch Guidance, a digital towing feature that lets you view your trailer and hitch on an in-cabin display. When attaching the trailer to the hitch, you can see a visual guideline on your display screen that allows you to attach the two with perfect precision.

4. GMC Sierra HD Pro Safety

GMC Sierra HD pickups come with an exclusive safety package that goes above and beyond to protect you from common causes of accidents. The Sierra HD Pro Safety package uses assistive functions like automatic emergency braking, front pedestrian braking, and forward collision alert to prevent collisions. The GMC Sierra HD Pro Safety package also includes Buckle to Drive, lane departure warning, and IntelliBeam automatic high beams.

5. Available GMC MultiPro Tailgate

The available GMC MultiPro tailgate elevates your hauling experience in the new Sierra HD by offering six possible configurations to accommodate different types of cargo. You can fold the top portion outward to create a set of steps or fold this portion down when the tailgate is closed to haul long items like pieces of wood. The MultiPro tailgate also has a power lock and release function.

Experience the new GMC Sierra HD at Dorsey-Jones GMC in El Reno, OK, today!

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