MoparPartsGiant.com offers the wholesale prices for genuine 2012 Ram 1500 parts. Parts like Gear Rack & Pinion are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 8 Cyl 4.7L, 8 Cyl 5.7L. Transmission: 5-Speed Automatic Transmission, 6-Speed Automatic Transmission.