MoparPartsGiant.com offers the wholesale prices for genuine 2020 Jeep Wrangler parts. Parts like Wiring, Automatic Transmission are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 4 Cyl 2.0L, 6 Cyl 3.0L Diesel, 6 Cyl 3.6L. Transmission: 6-Speed Manual Transmission, 8-Speed Automatic Transmission.