Initial Inspection and Diagnostic Overview

It is important to get an accurate description of the concern before any diagnosis can be carried out. Ask questions as to whether it occurs when hot or cold, during shifting, driving at a particular speed or in a particular gear. If possible, have the customer demonstrate the concern.
^ With the vehicle at a complete stop, shift through all the gears and evaluate the noise at different engine rpm. Check for any noises in NEUTRAL at different engine rpm.