"Summit White 2026 GMC Sierra 2500HD SLT 4WD 10-Speed Automatic Duramax 6.6L V8 Turbodiesel 10-Speed Automatic, 4WD, Dark Walnut/Slate Leather. From the hardworking Elevation and the off-road-ready AT4 to the luxurious Denali, theres a GMC ready to help you take on whatever lies ahead! Greg Lair GMC is home of the FREE LIFETIME POWERTRAIN WARRANTY!** ""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!"