At the heart of the 2026 GMC Sierra 2500HD SLT is a robust powertrain lineup engineered to handle the toughest jobs with confidence. The standard engine is a 6.6-liter V8 gasoline engine producing 401 horsepower and 464 pound-feet of torque, paired with a six-speed automatic transmission. For those who need even more pulling power, the available Duramax 6.6-liter turbo-diesel V8 cranks out an impressive 470 horsepower and a massive 975 pound-feet of torque, mated to a 10-speed Allison automatic transmission. Maximum available towing capacity reaches up to 36,000 pounds when properly equipped, and available four-wheel drive ensures confident handling across a wide range of terrain and conditions.

Step inside the Sierra 2500HD SLT and you'll find a cabin designed with both comfort and function in mind. The SLT trim elevates the experience with leather-appointed seating, available heated front and rear seats, and available ventilated front seats for added comfort during long days on the job. A 12.3-inch diagonal digital instrument cluster keeps essential information front and center, while available features like a heated steering wheel and power-adjustable driver's seat make it easier to settle in for the long haul. Rear-seat passengers enjoy generous legroom, and the crew cab configuration provides a truly spacious environment for a full crew.

The 2026 Sierra 2500HD SLT is well-equipped with technology designed to keep you connected and in control. The centerpiece is a 13.4-inch diagonal color touchscreen running GMC's intuitive infotainment system, with wireless Apple CarPlay and Android Auto compatibility for seamless smartphone integration. A built-in Wi-Fi hotspot keeps everyone connected on the go, while available wireless device charging eliminates cord clutter. Available Super Cruise, GMC's hands-free driver assistance technology, adds a new level of confidence on compatible roads. The available ProGrade Trailering System offers an impressive suite of trailering camera views and tools to simplify hitch connections and monitoring while hauling.

GMC has loaded the 2026 Sierra 2500HD SLT with a comprehensive suite of driver assistance and safety technologies. Standard and available features include Forward Collision Alert, Automatic Emergency Braking, Lane Change Alert with Side Blind Zone Alert, and Rear Cross Traffic Alert. Available features like Rear Park Assist and the HD Surround Vision camera system with multiple viewing angles make maneuvering this large truck far more manageable, whether you're in a tight parking lot or backing up to a trailer. The available Head-Up Display projects key vehicle data directly into your line of sight to help you keep your eyes on the road.

The 2026 GMC Sierra 2500HD is available in a well-rounded lineup of trim levels to suit a variety of needs and budgets. The lineup kicks off with the Pro, followed by the SLE, and then the SLT, which strikes a strong balance between capability and premium refinement. Above the SLT, shoppers can choose the AT4, which adds serious off-road credentials, or step all the way up to the Denali and Denali Ultimate for the pinnacle of luxury and technology in a heavy-duty truck. Each trim is available in multiple cab and bed configurations, giving buyers the flexibility to build the perfect truck for their lifestyle.

The 2026 GMC Sierra 2500HD SLT brings together the muscle you need and the refinement you want in a single, compelling package. If you're ready to experience it for yourself, stop by and explore your options today.