The official notice
Defect
On certain vehicles, the rear axle was not properly filled with oil. As a result, the tail bearings could seize, and the pinion stem could break. If this happens, the driveshaft could separate from the rear axle and cause a loss of power to the wheels. This could also cause the vehicle to move when the transmission is in Park, if the parking brake is not used. Note: This recall only affects certain vehicles equipped with a 9.75" rear axle and a gasoline engine.
Safety Risk
A loss of power to the wheels could increase the risk of a crash. Additionally, a parked vehicle that moves suddenly could create the risk of an injury or a crash.
Remedy
Ford will notify owners by mail and advise you to take your vehicle to a dealership to have the rear axle inspected. It will be repaired and/or parts will be replaced, as necessary.