FordPartsGiant.com offers the wholesale prices for genuine 2003 Ford Explorer Sport Trac parts. Parts like Clutch 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. Transmission: 5-Speed Automatic Transmission - 5R44E/5R55E, 5-Speed Manual Transmission - R1HD.