MoparPartsGiant.com offers the wholesale prices for genuine 1991 Dodge Ram Wagon parts. Parts like Control, Air Conditioner 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. Transmission: 3-Speed Automatic Transmission, 4-Speed Automatic Transmission, 5-Speed Manual Transmission.