The 2025 GMC Sierra HD is built to excel in performance, featuring powerful engine options that ensure top-tier towing and hauling capabilities. Choose between the 6.6L gas V8 engine or the Duramax® 6.6L Turbo-Diesel, which delivers a staggering 910 lb.-ft. of torque, allowing for a towing capacity of up to 36,000 lbs. Both engines are paired with the smooth-shifting Allison® 10-speed automatic transmission for enhanced control and efficiency on the road.

In addition to raw power, the Sierra HD offers performance-enhancing features like available four-wheel drive, advanced suspension systems, and off-road packages designed to tackle rough terrains. Whether you’re towing a trailer or navigating challenging landscapes, the Sierra HD’s performance features are engineered to help you get the job done efficiently and safely.

• 6.6L V8 and Duramax® 6.6L Turbo-Diesel engines
• 910 lb.-ft. of torque
• Up to 36,000 lbs. towing capacity
• Allison® 10-speed automatic transmission
• Available four-wheel drive
• Advanced suspension systems

Sierra HD Towing Capacity

The 2025 GMC Sierra HD comes equipped with cutting-edge technology that enhances convenience, connectivity, and control. The centerpiece of its tech offerings is the large 13.4-inch touchscreen, which integrates with wireless Apple CarPlay® and Android Auto™ for seamless smartphone connectivity. In addition, drivers benefit from an available 12.3-inch digital driver information center that displays real-time data and vehicle information.

For those who need extra assistance while towing, the Sierra HD features an available ProGrade™ Trailering System, complete with up to 15 camera views for a clear and confident towing experience. Stay connected, informed, and in control with the advanced technology that the Sierra HD offers.

• 13.4-inch touchscreen infotainment system
• Wireless Apple CarPlay® and Android Auto™
• 12.3-inch digital driver information center
• ProGrade™ Trailering System with 15 camera views
• Premium Bose® audio system
• Built-in Wi-Fi hotspot

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Safety is a key priority in the 2025 GMC Sierra HD, with a range of advanced safety and driver-assistance features that provide peace of mind for you and your passengers. The GMC Pro Safety package comes standard and includes features like Forward Collision Alert, Automatic Emergency Braking, and Lane Departure Warning to help prevent accidents before they happen.

For additional security, available features like the HD Surround Vision Camera and Rear Cross Traffic Alert enhance your visibility and awareness, especially when towing or navigating tight spaces. With these comprehensive safety features, the Sierra HD ensures that every drive is as secure as possible.

• GMC Pro Safety package
• Forward Collision Alert
• Automatic Emergency Braking
• Lane Departure Warning
• HD Surround Vision Camera
• Rear Cross Traffic Alert

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The interior of the 2025 GMC Sierra HD combines comfort, luxury, and practicality, making it a top choice for those who spend long hours on the road. The spacious cabin features premium materials like available leather-appointed seating, wood accents, and a customizable center console to accommodate your storage needs. With best-in-class front head and legroom, the Sierra HD ensures that you and your passengers are comfortable on every drive.

In addition to comfort, the interior offers practical features like an available power-sliding rear window and multiple USB charging ports to keep you connected and organized. Whether you’re commuting or embarking on long trips, the Sierra HD’s interior is designed with both comfort and function in mind.

• Leather-appointed seating
• Real wood accents
• Best-in-class front head and legroom
• Customizable center console
• Power-sliding rear window
• USB charging ports

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