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:

Cleaning the windows and wiper blades
The windows and wiper blades should be cleaned regularly. If the wipers do not wipe properly, substances on the vehicle’s glass or the wiper blades may be the cause. These may include hot wax treatments used by commercial car washes, water repellent coatings ...

Input Shaft and Bearing
Special Tool(s) Remover, Driver Pinion Bearing Cone 205-D002 (D79L-4621-A) or equivalent Installer, Drive Pinion Bearing Cone 205-011 (T57L-4621-B) Remover/Installer, Bearing Tube 308-024 (T75L-7025-B) Disas ...

Installation
NOTE: Do not use a fiber disc to clean the surfaces. Fibers from the disc can get into the oil pan and oil and clog the oil bypass valve. 1. Clean and inspect the cylinder head for flatness. 2. Install a new head gasket on the cylinder block with the sm ...