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:

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 ...

Piston - Pin Diameter
1. Measure the piston pin diameter in two directions at the points shown. Verify the diameter is within specification. Refer to the appropriate section in Group for the procedure. If out of specification, install new components as necessary. Refer ...

Driveline Angle
  Item Description 1 Bottom of the frame 2 Engine crankshaft centerline 3 Engine angle 4 Driveshaft and coupling shaft centerline 5 Driveshaft and coupling shaft angle 6 Rear axle pinion centerline ...