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