MoparPartsGiant.com offers the wholesale prices for genuine 1988 Jeep Wagoneer parts. Parts like Crankshaft & Piston 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.