MoparPartsGiant.com offers the wholesale prices for genuine 1998 Jeep Grand Cherokee parts. Parts like Rear Seat are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 4.0L, 8 Cyl 5.2L, 8 Cyl 5.9L. Transmission: 4-Speed Automatic Transmission.