MoparPartsGiant.com offers the wholesale prices for genuine 1988 Jeep Wagoneer parts. Parts like Gear Train, Reverse Idler are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.5L, 6 Cyl 4.0L, 6 Cyl 4.2L. Transmission: 4-Speed Automatic Transmission, 4-Speed Manual Transmission, 5-Speed Automatic Transmission, 5-Speed Manual Transmission.