Ford Mustang (1999-2004) Service Manual: Gear Howl and Whine

Howling or whining of the ring gear and pinion is due to an incorrect gear pattern, gear damage or incorrect bearing preload.

Wheel Hub or Axle Flange Face Runout
NOTE: If the axle shaft assembly is removed, check runout of the shaft itself. The forged (unmachined) part of the shaft is allowed to have as much as 3.0 mm (0.120 inch) runout. This alone will not ...

Bearing Whine
Bearing whine is a high-pitched sound similar to a whistle. It is usually caused by worn/damaged pinion bearings, which are operating at driveshaft speed. Bearing noise occurs at all driving speeds. ...

Other materials:

Installation
All axles 1. Position the ring gear and the differential case. Align the bolt holes by starting two bolts through the holes in the differential case and the ring gear. Press the ring gear on the differential case. 2. Install the bolts. Apply Stud and Bea ...

Rear Drive Axle and Differential
  The differential housing (4010) consists of a cast aluminum housing and a cast aluminum differential housing cover (4033). The differential housing cover uses silicone sealant as a gasket. The hypoid-design gearset consists of a 8.8-inch ...

Parking Brake (Description and Operation)
  The parking brake system is cable-actuated and controlled by an independent hand-operated parking brake control (2780). To apply parking brake, pull parking brake control upward as far as possible. The parking brake system is an AUTO-ADJUST system ...