Three problems related to differential unit have been reported for the 1999 Ford Expedition. The most recently reported issues are listed below.
The contact owns a 1999 Ford Expedition. The contact stated that while driving 45 mph, the rear differential dropped and caused him to lose control of the vehicle. The vehicle swerved and then flipped over. The contact inspected the vehicle and discovered that the rear suspension was completely corroded. A police report was not filed and no injuries were reported. The vehicle was not taken to the dealer. The manufacturer was not made aware of the failure. The vehicle was destroyed. The failure and current mileage was 225,000.
A "spacer" within the differential disintegrated, and caused the differential to shift which resulted in a rear wheel lock up while driving. The unit was completely sealed for no reason. There was noise coming from the rear end and the anti lock brakes activated. As the consumer immediately pulled over, the transmission locked up, and the vehicle started to shake. The carrier bearing was completely destroyed and caused the ring to move away from the pinion gear and destroyed all of the rear axle components.
In reference to rear differential seal blew out, causing failure of both sets of rear brakes/ discs and parking drums.