6-Speed Automatic HD Electronic with Overdrive, 4WD, Cloth. 2018 GMC Sierra 2500HD SLE 4WD Black Recent Arrival! 6-Speed Automatic HD Electronic with Overdrive Vortec 6.0L V8 SFI Flex Fuel VVTThe Davidson Family has been involved in local business and their local communities for over 60 years. Our family of dealerships now includes five franchise stores and three collision centers across Central and Northern New York. With a vision of ensuring a happy family of employees and customers, we take pride in providing the best possible automotive experience. We invite you to stop in and let us show you why we are Nice People To Do Business With!.