Key Features of the 2026 GMC Sierra 1500 SLT

5.3L V8 engine with 10-speed automatic transmission

Under the hood, SLT features a 5.3L V8 paired with a 10-speed automatic transmission, a proven combination engineered for confident, consistent performance. The wide gear spread of the 10-speed helps the V8 stay in its sweet spot more often, maintaining responsive acceleration when you need it and settling into low rpm cruising when you want it quiet and composed. Whether you are merging onto I-20, running a full bed of materials to a job, or towing across rolling highway, the powertrain feels unflustered and in command. The transmission’s smooth, quick shifts add polish to everyday driving, while the V8’s broad powerband supports the Sierra’s work-ready nature. It is an ideal match for drivers who demand muscle and refinement in equal measure.

Duramax 3.0L Turbo-Diesel engine

For drivers who want long-haul efficiency and diesel torque, SLT offers the available Duramax 3.0L Turbo-Diesel engine with a 10-speed automatic transmission. It is engineered for low-end grunt and relaxed cruising—ideal for towing, highway miles, and steady-state trips that define life around the Midlands. When properly equipped, Sierra 1500 models with diesel power boast available max diesel towing capacity of up to 13,300 lbs. The diesel pairs well with the Max Trailering Package to help keep engine and driveline temperatures in check when hauling near capacity, while the 10-speed’s close ratios support steady pull and smooth downshifts on grades. If your days often include a trailer, the diesel stands out for its calm, capable character.

13.4" diagonal Premium GMC Infotainment System with Google built-in compatibility

The available 13.4-inch Premium GMC Infotainment System brings a crisp, expansive display to the center of the SLT cabin, anchored by Google built-in compatibility for seamless navigation, voice assistance, and in-vehicle apps. Pair your compatible smartphone with wireless phone projection to see your preferred apps, maps, and media on the large touchscreen without extra cables cluttering the console. Nearby, the available 12.3-inch multicolor Driver Information Center places high-priority vehicle data directly in your sightline, helping you stay focused on the road. The interface is thoughtfully organized, responsive to touch, and bolstered by quick-access physical controls, so you can make changes without fuss when traffic heats up around near Columbia, SC.

ProGrade® Trailering System

Available on the SLT, the ProGrade® Trailering System helps simplify hitching, towing, and monitoring your trailer through integrated, truck-specific tools. From the infotainment screen, access helpful checklists and specialized camera views, then use in-vehicle diagnostics and trailer profiles to keep tabs on lighting and maintenance. When combined with the integrated trailer brake controller—engineered to work with Sierra’s antilock brake system for measured electric-controlled trailer braking—you gain a more connected, confident experience on the road. Add the available Max Trailering Package, and you can bolster cooling, suspension tuning, and electrical output to help the truck manage heavier loads with composure.

World’s First Six-Function MultiPro™ Tailgate

The available MultiPro™ Tailgate is a game changer for daily versatility. With six distinct functions, it supports everything from easier bed access and loading to creating a sturdy work surface on site or at home. Pair it with the available MultiPro Tailgate Audio System by KICKER for a portable, weather-resistant sound solution that lets you bring music to the tailgate, campsite, or job. The Sierra’s high-strength steel bed offers generous volume and clever touches like multiple tie-downs that help secure cargo of all shapes and sizes. Together, the bed and tailgate transform the rear of the truck into a flexible workspace that adapts to your to-do list as it changes throughout the week.