Powerful, Capable, and Refined - The 2026 GMC Sierra 3500HD AT4 Stands OutThis 2026 GMC Sierra 3500HD AT4 is a true workhorse, blending exceptional capability with premium comfort and technology. With its Duramax 6.6L V8 Turbodiesel engine and 4WD system, this Sierra 3500HD is ready to take on any challenge, whether it's hauling heavy loads or conquering rugged terrain.- 4x4/4WD- Apple CarPlay / Android Auto- Heated Seats- Premium Audio- Truck Spray-In Bed LinerThe Sierra's impressive list of features continues, including the Bose Premium 7-Speaker Sound System, Memory Seat, Heated Steering Wheel, Wireless Charging, and more. Elevating the driving experience, this AT4 model also boasts an Off-Road Suspension, 220 Amp Alternator, and Engine Block Heater, ensuring it's ready for any adventure.Comfort and convenience are paramount, with amenities like Dual-Zone Automatic Climate Control, Power Front Windows, Remote Keyless Entry, and a Power Driver's Seat with Memory. The Sierra's impressive technology suite includes the Premium GMC Infotainment System, SiriusXM with 360L, and a 13.4"" Diagonal Information Display.Safety is also a top priority, with features like Forward Collision Alert, Automatic Emergency Braking, Lane Departure Warning, and Rear Cross Traffic Alert providing peace of mind on the road.Whether you're hauling heavy loads, towing a trailer, or simply seeking a capable and well-appointed truck, the 2026 GMC Sierra 3500HD AT4 is a standout choice. Experience the perfect blend of power, technology, and refinement for yourself.For more than 100 years, Speck Dealership has proudly remained family-owned and committed to serving our community. We're honored to help drivers from Pasco, Kennewick, Richland, Tri-Cities, Hermiston, Umatilla, Prosser, Grandview, Sunnyside and Yakima find the right vehicle with our extensive selection of new GMC trucks and SUVs. When you're looking for competitive pricing, variety, and a new car dealer you can trust, your search starts and ends at Speck Buick GMC of Tri-Cities. *All prices plus applicable sales tax, license, and a negotiable documentary service fee up to $200 may be added to sales price or capitalized cost of the vehicle. One vehicle unless otherwise noted and subject to prior sale without notice. While supplies last. All advertised vehicles sold as-is without any implied warranty from the dealer unless specifically noted. Price expires today.