MoparPartsGiant.com offers the wholesale prices for genuine 1988 Dodge W350 parts. Parts like Gear Train, Overdrive are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.9L, 8 Cyl 5.2L, 8 Cyl 5.9L, All Engines. Transmission: 4-Speed Manual Transmission, 5-Speed Manual Transmission, Automatic Transmission.