MoparPartsGiant.com offers the wholesale prices for genuine 2015 Ram 1500 parts. Parts like Crew Cab, Rear Seat Hardware, Bench are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.0L Diesel, 6 Cyl 3.6L, 8 Cyl 5.7L. Transmission: 6-Speed Automatic Transmission, 8-Speed Automatic Transmission.