MoparPartsGiant.com offers the wholesale prices for genuine 1998 Jeep Grand Cherokee parts. Parts like Valve Body Servos 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.