Initial Inspection and Diagnostic Overview

Inspection and Verification
To guarantee as accurate diagnosis:
^ get an accurate description of the condition.
^ identify when the condition occurs: when hot. or cold, during shifting, driving at a particular speed or in a particular gear.
^ have the customer duplicate the concern, if possible.
^ refer to the Symptom Chart for additional source information and suggest test procedure. Symptom Related Diagnostic Procedures
^ carry out the following Noise Evaluation procedures, as necessary.

Noise Evaluation

NOTE: Carry out this evaluation with the transmission cold and at normal operating temperature. Listen for any changes in noise as the transmission warms up.

a. Start the engine.
b. Evaluate the noise in NEUTRAL while the vehicle is parked.
c. Listen for any change in noise while depressing and releasing the clutch pedal.
d. Listen for any change in noise while changing engine rpm.
e. Drive the vehicle and shift through all of the gear ranges, including REVERSE. Listen for any change in noise in a particular gear.
f. Drive the vehicle in gear in which the noise is most noticeable. Depress the clutch pedal and leave the gear engage. Listen for any change in noise. The vibration of the engine may be amplifying the noise.
g. Drive the vehicle in gear in which the noise is most noticeable. Depress the clutch pedal and shift into NEUTRAL. Release the clutch pedal and allow the vehicle to coast. Evaluate the noise as the rear axle turns the mainshaft.