MoparPartsGiant.com offers the wholesale prices for genuine 2003 Jeep Liberty parts. Parts like Transmission Assembly 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 3.7L. Transmission: 4-Speed Automatic Transmission, 5-Speed Manual Transmission, Multi-Speed Automatic Transmission.