2024 GMC Sierra 3500HD Denali Onyx Black 10-Speed Automatic, 4WD, Jet Black w/Forge Perforated Leather-Appointed Seat Trim.10-Speed Automatic Duramax 6.6L V8 Turbodiesel 4WDIndy's largest selection of Buicks, GMC Trucks, Kias and Mitsubishis. Ray Skillman Auto Center in Indianapolis, IN, also serving Greenwood, IN and Plainfield, IN is proud to be an automotive leader in our area. Since opening our doors, Ray Skillman Auto Center has kept a firm commitment to our customers. We offer a wide selection of vehicles and hope to make the car buying process as quick and hassle free as possible. Conveniently located just 1/2 mile north of Greenwood Park Mall on US 31 S.