FordPartsGiant.com offers the wholesale prices for genuine 2008 Ford Explorer Sport Trac parts. Parts like Alternator and Mountings are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 4.0L SOHC EFI, 8 Cyl 4.6L. Transmission: 5-Speed Automatic Transmission 5R55S, 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission 6R60.