MoparPartsGiant.com offers the wholesale prices for genuine 1986 Jeep Grand Wagoneer parts. Parts like Fuel Tank are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 4.2L, 8 Cyl 5.9L. Transmission: 4-Speed Manual Transmission, Automatic Transmission.