New 2026 GMC Sierra 2500HD AT4 For Sale Old Saybrook, CT

Drive into the future with this new 2026 GMC Sierra 2500 HD 4WD Crew Cab AT4 in striking White. Powered by a robust 6.6L V8 engine delivering 401hp and paired with a 10-speed Allison automatic transmission, this truck is built for both work and adventure. The AT4 trim delivers off-road capability with X31 Off-Road Package, Rancho shocks, skid plates, and hill descent control. Inside, experience luxury and comfort with leather front bucket seats, heated and ventilated front seats, heated rear seats, a Bose Premium 7-speaker sound system, and a 13.4-inch touchscreen with wireless Apple CarPlay/Android Auto. The AT4 Premium Plus Package adds a power sunroof, Head-Up Display, HD Surround Vision, and Power Retractable Assist Steps. Safety is paramount with GMC Sierra HD Pro Safety, Forward Collision Alert, Lane Departure Warning, Front and Rear Park Assist, and Trailer Side Blind Zone Alert. Enjoy convenience features like MultiPro Tailgate, spray-on bedliner, remote start, and advanced trailering technology. With its commanding presence, advanced tech, and off-road prowess, this Sierra 2500 HD AT4 is ready for anything.