2025 GMC Sierra 3500 HD at Thornhill GM Superstore

See the 2025 GMC Sierra 3500 HD at Thornhill GM Superstore

The 2025 GMC Sierra 3500 HD is the right vehicle for the toughest jobs. This heavy-duty truck is built for people who need to haul and tow heavy things. It mixes robust power with high-end comfort and the top features that GMC is known for. After a recent major update, the 2025 Sierra 3500 HD continues to offer a premium interior packed with tech and improved engine options, making it a leader in its class.

In the heavy-duty truck market, the Sierra 3500 HD competes with the Ford F-350 Super Duty and the RAM 3500. The Sierra 3500 HD stands out in a few key ways, notably with its available Duramax® Turbo-Diesel engine, which is paired with an Allison® transmission. Its top Denali and Denali Ultimate trims are also noted for their luxury features.

These trims are ideal for people who want the best in performance and quality.

The 2025 GMC Sierra 3500 HD is available in the following trims in single-rear-wheel or dual-rear-wheel configurations:

• Pro
• SLE
• SLT
• AT4
• Denali
• Denali Ultimate

This lineup provides a clear pathway for every heavy-duty truck owner. It starts with the work-focused and durable Pro trim and moves to the well-equipped SLE and premium SLT, and then to the off-road-specialized AT4. At the top of the range, the Denali and Denali Ultimate trims offer luxury touches and high-tech features in the heavy-duty segment.

Our team at Thornhill GM Superstore can guide you through every configuration. Visit our showroom to explore a 2025 GMC Sierra 3500 HD for sale in Chapmanville, WV.

Interior: Durable Utility Meets First-Class Comfort

The interior of the 2025 GMC Sierra 3500 HD is built around a powerful idea: a heavy-duty truck should be a practical tool when you need it and a comfortable retreat when you want it. For the workday, the Pro trim is a straightforward command center. It features resilient cloth or vinyl seats designed to withstand the rigors of the job, with a standard 7-inch touchscreen.

The Sierra’s character transforms in the SLE, SLT, AT4, and Denali trims. A 13.4-inch touchscreen anchors the dash, complemented by a 12.3-inch digital driver display. Surfaces are appointed with available perforated leather and authentic wood trim, while the available 16-way power front seats offer heating, ventilation, and even a massage feature for long hauls.

To ensure the truck is the right fit for any task, it’s offered in Regular, Double, and the expansive Crew Cab configurations.

Exterior: Bold Proportions and Smart Functionality

The 2025 GMC Sierra 3500 HD features an image of pure strength with its massive grille, tall, confident stance, and sculpted bodywork. The front-end design, with distinctive C-shaped LED signature lighting, is both bold and functional, providing excellent illumination. The truck is available in single-rear-wheel (SRW) or dual-rear-wheel (DRW) configurations, the latter providing the utmost stability for the heaviest trailering tasks.

Functionality is built into every aspect of the exterior. The industry-first, available six-function MultiPro Tailgate offers unparalleled flexibility for loading, unloading, and accessing the cargo bed.

The durable cargo bed is available in two sizes: Standard Bed (6'9") or Long Bed (8'2"). It features integrated BedSteps for easy side access.

Wheel options are extensive, starting with durable steel wheels on the Pro and progressing to massive 20-inch or 22-inch aluminum wheels on higher trims.

The available exterior colors include the following:

• Summit White
• Onyx Black
• Cardinal Red
• Sterling Metallic
• Downpour Metallic
• White Frost Tricoat

Performance: The Power to Move Heavy Loads

The 2025 GMC Sierra 3500 HD offers two powerful engine options. Both are paired with a robust Allison® 10-speed automatic transmission designed for heavy loads and smooth power delivery.

The standard engine is a powerful 6.6-liter V8 gasoline engine, delivering 401 horsepower and 464 lb-ft of torque. For the ultimate in trailering power, the available 6.6-liter Duramax® Turbo-Diesel V8 engine is the top choice. It produces 470 horsepower and a massive 975 lb-ft of torque.

This is a truck built for work. When properly configured (typically a DRW model with the Duramax engine and a gooseneck/fifth-wheel hitch), the Sierra 3500 HD boasts a staggering maximum towing capacity of up to 36,000 pounds. Its maximum payload capacity is also impressive, allowing you to haul thousands of pounds in the bed depending on the configuration.

Find Your 2025 GMC Sierra 3500 HD at Thornhill GM Superstore

When the job demands serious power and professional-grade capability, the 2025 GMC Sierra 3500 HD is the answer. From its dominant powertrains to its advanced trailering technology and available luxurious interiors, this heavy-duty truck exceeds expectations.

Swing by Thornhill GM Superstore to explore a 2025 GMC Sierra 3500 HD for sale in Chapmanville, WV. Our team is ready to help you choose the perfect truck for your towing and hauling needs. Contact us today to learn more about this incredible heavy-duty machine.

*Bluetooth® word marks and logos are registered trademarks owned by Bluetooth SIG, Inc., and any use of such marks by GMC is under license. A compatible Bluetooth®-enabled phone must first be paired. Phone performance depends on software, coverage, and carrier.

Disclaimer: This content was drafted with AI assistance for initial drafting, reviewed by a subject-matter expert for accuracy, and edited by our team of writers and editors.