MoparPartsGiant.com offers the wholesale prices for genuine 1987 Jeep Grand Wagoneer parts. Parts like Oil Pump, Gear Train, Output Shaft 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 4.2L, 8 Cyl 5.9L. Transmission: 4-Speed Manual Transmission, 5-Speed Manual Transmission, Automatic Transmission.