MoparPartsGiant.com offers the wholesale prices for genuine 2019 Ram 1500 New Style 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 3.0L Diesel, 6 Cyl 3.6L, 8 Cyl 5.7L. Transmission: 8-Speed Automatic Transmission.