FordPartsGiant.com offers the wholesale prices for genuine 2006 Mercury Monterey parts. Parts like Crankshaft/Pistons and Bearings are shipped directly from authorized Ford dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 3.9L OHV EFI NA, 6 Cyl 4.2L OHV EFI. Transmission: 4AT AX4N.