Section 05-00: Axle and Driveshaft—Service
1994 Mustang Workshop Manual
DIAGNOSIS AND TESTING

Symptom Chart: Rear Axle Diagnosis

REAR AXLE DIAGNOSIS
ConditionPossible SourceAction
  • Excessive Rear Axle Noise
  • Differential case.
  • Road test vehicle to ensure concern is rear axle noise rather than other system noise. Refer to General Diagnostic Procedure. Service and replace parts as required.
  • Loud "Clunk" In Driveshaft When Shifting From REVERSE to DRIVE
  • Driveshaft.
  • Raise vehicle, rotate driveshaft by hand to isolate concern as a driveshaft or rear axle concern. Service as required.
 
  • Rear axle shaft or carrier.
  • Remove and inspect. Service as necessary.
  • Limited-Slip or Traction-Lok Axle Does Not Work in Snow, Mud or on Ice
  • Differential.
  • Perform Traction-Lok Differential Operation as outlined. Service as required.
  • On Turns, The Rear Axle Has a High-Pitched Chattering Noise (Limited-Slip or Traction-Lok Axles Only). Slight Chatter Noise on Slow Turns After Extended Highway Driving is Considered Acceptable and Has No Detrimental Effect on the Locking Axle Function
  • Lubricant.
  • Road test vehicle—drive vehicle in tight circles—5 clockwise and 5 counterclockwise. If chatter is still evident, flush and replace with Rear Axle Lubricant XY-90-QL or equivalent—plus 4 ounces of Friction Modifier C8AZ-19B546-A or equivalent, meeting Ford specification ESP-M2C154-A.
 
  • Differential.
  • Remove parking brake lever boot retainer. Service as required.