Begin the rear drive axle system diagnosis with the Diagnostic Starting Point - Vibration Diagnosis and Correction in Vibration Diagnosis and Correction. The use of the Diagnostic Starting Point - Vibration Diagnosis and Correction will determine if the concern is related to the rear drive axle. When instructed to exit the Vibration Diagnosis and Correction diagnostic and return to the Diagnostic Starting Point - Rear Drive Axle, proceed to Symptoms - Rear Drive Axle in order to isolate and identify rear drive axle related concerns.