New 2025 GMC Sierra 2500HD AT4

Description for 2025 GMC Sierra 2500HD AT4 Truck

The 2025 GMC Sierra 2500HD AT4 is a heavy-duty pickup built to balance off-road readiness with premium technology and interior refinement. Powered by the renowned Duramax 6.6L V8 turbodiesel engine paired with a 10-speed automatic transmission and four-wheel drive, this model delivers the torque and hauling capability expected in a three-quarter-ton truck while incorporating an array of modern systems tailored to demanding work and trail environments.

The AT4 trim prioritizes off-road performance with the inclusion of the X31 Off-Road Package, which enhances suspension components and adds features like hill descent control for greater confidence on uneven terrain. A 2-speed active transfer case offers greater control in low-traction conditions, while the AT4-exclusive high clearance steps and underbody protections reflect its readiness for rugged use. The Gooseneck/5th Wheel Prep Package furthers its capability for towing heavy loads.

This Crew Cab variant is finished in Summit White and features Jet Black leather upholstery with Kalahari accents, giving the cabin a refined yet purposeful character. Comfort and utility are at the forefront inside, with front and rear premium floor liners, a floor-mounted center console, and ventilated and heated front seats, along with heated second-row outboard seats. A power sunroof and dual-zone climate control add to the overall convenience and comfort.

Technology is integrated throughout the vehicle. A multicolor 15-inch diagonal head-up display and a high-resolution HD Surround Vision camera system offer enhanced visibility, while the Technology Package also includes an inside rearview auto-dimming rear camera mirror and wireless charging. The infotainment system supports wireless Apple CarPlay and Android Auto and is accompanied by a Bose premium 7-speaker sound system for high-quality audio throughout the cabin.

For trailering, the Sierra 2500HD AT4 comes equipped with an advanced suite of tools, including a bed view camera with two trailer camera provisions, Trailer Side Blind Zone Alert, Hitch Guidance, and Trailer Viewing Software. These features are aimed at making towing and maneuvering safer and more intuitive. Additionally, Rear Cross Traffic Alert and Ultrasonic Front & Rear Park Assist provide further situational awareness.

Utility is expanded with both a 120-volt outlet in the bed and another in the instrument panel, LED cargo area lighting, a spray-on bedliner with the GMC logo, and deep-tinted glass. Convenience features such as Remote Vehicle Start, a power sliding rear window with defogger, and universal home remote round out a well-equipped package suited for demanding use.

The AT4 Premium Plus and AT4 Preferred Packages combine to offer a comprehensive set of luxury, safety, and convenience enhancements. Standard safety systems also include the Safety Alert Seat, which provides directional vibration feedback for certain driver alerts, and an Unauthorized Entry Theft-Deterrent System for added security.

Every vehicle from Walt Massey includes the 3 Day Money Back Guarantee. With this program, you can return the vehicle within three business days of purchase (by 5 p.m. CST), as long as it is in "like new" condition and driven fewer than 300 miles. If the mileage exceeds 300 miles, a \$1.00 per mile fee applies. This policy offers peace of mind, allowing customers to confirm their purchase decision without pressure.

The 2025 Sierra 2500HD AT4 stands out as a capable, tech-forward option for buyers seeking a blend of rugged capability and upscale design in a heavy-duty platform.

Not all rebates may apply. Some rebates are not compatible with other rebates. Offers are subject to change. See dealer for details. Price includes: $1000 - Buick & GMC Select Market Incremental Consumer Cash. Exp. 06/30/2025 $500 - GM Military Cash Allowance Program. Exp. 01/02/2026