The rear wheels can lock up or the driveshaft can separate, and the National Highway Traffic Safety Administration said the tail bearings may seize after extended time in service.
The problem appears limited to a handful of vehicles with the max tow package, which should include a 9.75-inch tail bearing.
Ford found a rear axle with an 8.8-inch bearing in May, and dealers will replace it with the correct 9.75-inch component.
Notifications are scheduled for September 21.
The fourth recall involves the 2026 F-150 Raptor, where 17 trucks may have Panhard rod fasteners that were not properly tightened.
That can let the rod shift out of position and potentially cause a loss of control.
Ford blames an error-proofing device that was in bypass mode during production, leaving the company without torque data for some vehicles.
A February warranty claim over a rattle traced to a loose rear Panhard rod tipped Ford off, followed by a second claim in March.
Dealers will replace the Panhard rod fasteners with new ones and torque them to specification.
