Begin the system diagnosis by reviewing Rear Axle Disassembled Views , Rear Drive Axle Description and Operation , and Wheel Drive Shafts Description and Operation . Reviewing the description and operation information will help you determine the correct symptom diagnostic procedure when a condition exists. Reviewing the description and operation information will also help you determine if the condition described by the customer is normal operation. Refer to Symptoms - Rear Drive Axle in order to identify the correct procedure for diagnosing the system and where the procedure is located.