MoparPartsGiant.com offers the wholesale prices for genuine 2006 Jeep Grand Cherokee parts. Parts like Engine Covers And Components are shipped directly from authorized Mopar dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.7L, 8 Cyl 4.7L, 8 Cyl 5.7L, 8 Cyl 6.1L. Transmission: 5-Speed Automatic Transmission.