FordPartsGiant.com offers the wholesale prices for genuine 2015 Lincoln Navigator parts. Parts like Rear Door Lock Controls are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.5L GTDI, 8 Cyl 5.4L. Transmission: 4-Speed Automatic Transmission E4OD(4R100), 6-Speed Automatic Transmission (6R80), 6-Speed Automatic Transmission ZF 6HP26 Steptronic.