MoparPartsGiant.com offers the wholesale prices for genuine 2021 Jeep Grand Cherokee parts. Parts like Transmission / Transaxle 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 3.6L, 8 Cyl 5.7L, 8 Cyl 6.2L, 8 Cyl 6.4L. Transmission: 8-Speed Automatic Transmission.