The original 4WD locking hub on certain Ford and Lincoln SUVs and pickups often fails due to the brittle sintered shift dial breaking, or the rubber diaphragm dry-rotting over time. This OE FIX solution features a reinforced shift dial that is 40 percent stronger than the factory design, as well as an improved diaphragm made of HNBR rubber with anti-ozone, anti-oxidation and UV-resistant additives to help prevent future failures. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Ford Excursion: 2000, 2001, 2002, 2003, 2004, 2005] - [Ford Expedition: 2001, 2002] - [Ford F-250 Super Duty: 1999, 2000, 2001, 2002, 2003, 2004] - [Ford F-350 Super Duty: 1999, 2000, 2001, 2002, 2003, 2004] - [Ford F-450 Super Duty: 1999, 2000, 2001, 2002, 2003, 2004] - [Ford F-550 Super Duty: 1999, 2000, 2001, 2002, 2003, 2004] - [Lincoln Navigator: 2001, 2002]