Ford Mustang (1999-2004) Service Manual: Gear Howl and Whine

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:

Transmission (Installation)
Material Item Specification DEXRON III (ATF) Transmission Fluid XT-2-QDX or equivalent DEXRON III Pipe Sealant with Teflon D8AZ-19554-A or equivalent WSK-M2G350- A2 Premium Long Life Grease XG-1-C, K or T or equivalent ...

Four Wheel Anti-Lock Brake System (4WABS) Hydraulic Control Unit (HCU)
NOTE: This procedure only needs to be performed if the 4-wheel anti-lock brake (4WABS) hydraulic control unit (HCU) has been installed new or if the HCU lines have been opened. 1. Clean all dirt from and remove the brake master cylinder filler cap ...

Component Tests
Idle Air Control (IAC) Valve 1. Open the hood. 2. NOTE: Key symptom is elevated idle speed while noise is occurring. NOTE: "Snapping" the throttle can induce the noise. Verify the condition by operating the vehicle for a short time. 3. Inspect the IAC valv ...