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:

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 ...

Driveshaft (Removal and Installation)
Material Item Specification Threadlock and Sealer E0AZ-19554-AA WSK-M2G351-A5 (type II) Removal and Installation 1. Raise and support the vehicle. 2. Carry out the following: 1. Place an index mark on the rear axle pinion flange and ...

Knock
Knock, which can occur on all driving phases, has several causes including damaged teeth or gearset. In most cases, one of the following conditions will occur: 1. A gear tooth damaged on the drive side is a common cause of the knock. This can usually be cor ...