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:

Security Access - Procedure
Special Tool(s) Worldwide 418-F224, New Generation STAR (NGS) Tester 418-F052, or equivalent diagnostic tool NOTE: The security access procedure is utilized to obtain passive anti-theft system (PATS) security access. PATS security acce ...

Pinpoint Test B: LFC 21/DTC B1921 - RCM Bracket Ground Resistance High
Normal Operation WARNING: The tightening torque of the restraints control module (RCM) retaining bolts is critical for proper air bag supplemental restraint system (SRS) operation. Refer to Restraints Control Module (RCM) in this section for correc ...

Heater Core Backflushing
Special Tool(s) Flush Kit 164-R3658 or equivalent Drain Kit 164-R3662 or equivalent Material Item Specification Motorcraft Premium Cooling System Flush VC-1 or equivalent ESR-M14P7-A Motorcraft Premium ...