MoparPartsGiant.com offers the wholesale prices for genuine 2012 Jeep Grand Cherokee parts. Parts like Adjusters, Recliners & Shields - Passenger Seat - Power 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 6.4L. Transmission: 5-Speed Automatic Transmission, 6-Speed Automatic Transmission.