Review the system and operation in order to familiarize yourself with the system functions. Refer to Differential Carrier Assembly Description .
| • | Inspect the system for loose or missing fasteners. | 
| • | Inspect the system for leaking components. | 
| • | Inspect the system for obvious damage or conditions which may cause the symptom. | 
Refer to a system diagnostic procedure from the following list in order to diagnose the symptom: