MoparPartsGiant.com offers the wholesale prices for genuine 2006 Jeep Wrangler parts. Parts like Countershaft are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.4L, 6 Cyl 4.0L. Transmission: 4-Speed Automatic Transmission, 6-Speed Manual Transmission.