Begin the wheel drive shaft system diagnosis with the Diagnostic Starting Point - Vibration Diagnosis and Correction . The use of the Diagnostic Starting Point will help determine if the concern is wheel drive shaft related. When instructed to exit the Vibration Diagnosis and Correction diagnostic procedures, return to the Diagnostic Starting Point - Wheel Drive Shafts and proceed to Wheel Drive Shafts Description and Operation in order to become familiar with the design and function of the wheel drive shaft system. Reviewing the Description and Operation information will also help determine if the condition is a potential operating characteristic or not.