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:

Power Steering (Description and Operation)
System View Steering System Components - 3.8L Engine   Steering System Components - 4.6L Engine   Steering Gear Mounting   Steering Gear   Power Steering Pump - CII Power Steering Pump - CIII Power Steering Gear Identific ...

Special Testing Procedures
The special tests are designed to aid the technician in diagnosing the hydraulic and mechanical portion of the transmission. Engine Idle Speed Check Refer to the Powertrain Control/Emissions Diagnosis (PC/ED) manual for diagnosis and testing of the eng ...

Output State Control (OSC) Mode
Output State Control (OSC) allows the technician to take control of certain parameters to function the transmission. For example, OSC allows the technician to shift the transmission only when he/she commands a gear change. If the technician commands ...