Visual/Physical Inspection

Inspect for aftermarket equipment and modifications which could affect the operation of the wheel drive shafts or other rotating components.
Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
Thoroughly inspect the entire wheel drive shaft for visible damage, leaking joint seals, and missing seal clamps.
Inspect the wheel drive shaft seals for cuts, tears, or other damage which may allow the loss of lubricant and the entry of contaminates.