The 2026 GMC Sierra HD delivers best-in-class capability, rugged style, and innovative technology. At Gunn Buick GMC in Selma, TX, drivers from San Antonio, Universal City, and Schertz can experience a heavy-duty truck built to handle any challenge with ease.
If you're located in San Antonio, Universal City, Schertz or nearby, make Gunn Buick GMC your destination for the 2026 GMC Sierra HD. Browse our inventory today and see firsthand how this truck combines strength, luxury, and advanced engineering.
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Experience outstanding power and efficiency with the available Duramax 6.6L Turbo-Diesel V8. This engine pairs a high-performance turbocharger with a smooth 10-speed automatic transmission, giving you commanding capability for towing, hauling, and heavy-duty work.
Tow with confidence using the Sierra HD’s cutting-edge trailering technologies. From integrated camera views to trailer guidance systems, this truck makes hitching, towing, and maneuvering heavy loads safer and easier than ever.
The Sierra HD Denali Ultimate offers an upscale interior with Alpine Umber full-grain leather seating, intricate plaited contrast stitching, and embossed laser-etched topographical patterns inspired by its mountainous namesake—combining rugged durability with refined elegance.
Illuminate the road with style. LED projector headlamps and distinctive animated signature lighting enhance visibility while giving the Sierra HD a bold, modern presence day or night.
