MoparPartsGiant.com offers the wholesale prices for genuine 2010 Dodge Nitro parts. Parts like Rear Axle Assembly are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.7L, 6 Cyl 4.0L. Transmission: 4-Speed Automatic Transmission, 5-Speed Automatic Transmission.