MoparPartsGiant.com offers the wholesale prices for genuine 2003 Jeep Wrangler parts. Parts like Timing Belt & Cover are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.4L, 6 Cyl 4.0L. Transmission: 4-Speed Automatic Transmission, 5-Speed Manual Transmission.