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:

Bearings - Inspection
NOTE: If any of the following conditions exist, install a new bearing. 1. Inspect the bearing for a bent cage. 2. Inspect bearings for galling (metal smears on roller ends). Galling is caused by overheating, poor lubrication or an overload situatio ...

Using sync with your media player
You can access and play music from your digital music player over the vehicle’s speaker system using the system’s media menu or voice commands. You can also sort and play your music by specific categories, such as artists, albums, etc. SYNC is capable of ...

Rear Drive Axle and Differential
  The axle housing assembly consists of a cast center section with two steel tube assemblies and a stamped differential housing cover (4033). The differential housing cover uses silicone sealant as a gasket. The hypoid-design gearset consis ...