"Discover the ultimate in power, capability, and refined comfort with the 2026 GMC Sierra 2500HD AT4. This exceptional heavy-duty pickup is engineered to conquer any terrain, while delivering an unparalleled driving experience. - - - - - Duramax 6.6L V8 Turbodiesel Engine (470 hp, 975 lb-ft of torque) 10-Speed Automatic Transmission 4-Wheel Drive Bose Premium 7-Speaker Sound System Heated and Ventilated Leather-Appointed Seats Wireless Charging Multicolor 15"" Diagonal Head-Up Display - - - - - Beneath its rugged exterior lies a powerhouse of performance. The Duramax 6.6L V8 Turbodiesel engine delivers an astounding 470 horsepower and an incredible 975 lb-ft of torque, providing the muscle to tackle the toughest jobs with ease. Paired with a smooth-shifting 10-speed automatic transmission and a robust 4-wheel drive system, this Sierra 2500HD AT4 is ready to conquer any challenge, from hauling heavy loads to navigating the most demanding off-road terrain. The interior of the Sierra 2500HD AT4 is a sanctuary of refined comfort and advanced technology. Sink into the heated and ventilated leather-appointed seats and enjoy the rich, immersive sound of the Bose Premium 7-speaker audio system. Stay connected and informed with the Multicolor 15"" Diagonal Head-Up Display, which projects vital driving information directly into your line of sight. Wireless charging keeps your devices powered up, while the suite of advanced safety features, including Automatic Emergency Braking and Forward Collision Alert, provide added peace of mind. Whether you're tackling tough jobs or embarking on epic adventures, the 2026 GMC Sierra 2500HD AT4 is the ultimate heavy-duty companion. Its uncompromising capabilities, premium features, and exceptional comfort make it the perfect choice for those who demand the very best. ""Why buy from Greg Lair GMC"" you may ask...Greg Lair GMC is locally owned and operated and has been serving customers in the Amarillo, Lubbock, Clovis and surrounding panhandle and Tri-State area for over 30 years! You are our first priority! Greg Lair is home of the FREE LIFETIME POWERTRAIN WARRANTY for vehicles in our inventory with less than 100k miles on them at time of sale for your peace of mind! Our sales and service staff are friendly and knowledgeable and ready to provide you with a hassle free purchasing experience! At Greg Lair GMC all of our vehicles undergo a thorough multi-point vehicle inspection by certified GM Technicians to ensure that your next vehicle meets or exceeds industry performance and safety standards! Call or come by today for your very own personalized demonstration of the finest vehicles on the road today!"