MoparPartsGiant.com offers the wholesale prices for genuine 1991 Jeep Comanche parts. Parts like Brakes, Rear Drum are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.5L, 6 Cyl 4.0L. Transmission: 4-Speed Automatic Transmission, 4-Speed Manual Transmission, 5-Speed Manual Transmission.