The official notice
Defect
On certain vehicles, the left-rear axle shaft may not have been installed properly. As a result, the axle shaft splines could wear. If this happens, there could be a loss of power to the wheels. Additionally, if the vehicle is parked and the parking brake isn't applied, the vehicle could roll away. Note: This recall also affects certain incomplete vehicles.
Safety Risk
A loss of power to the wheels could increase the risk of a crash. A parked vehicle that rolls away 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 inspect and, if necessary, replace the left-rear axle shaft. If the axle shaft requires replacement, the dealer will also inspect and, as necessary, replace primary drive unit components.