Trouble Shooting: Noise

If abnormal vibration or driveline noise is present, check the following: Check drive shaft for damage or dents that could affect balance. Remove any undercoating adhering to shaft. Check for index marks on yoke and companion flange. If marks are not aligned, disconnect shaft and align index marks so they are as close as possible. Check for missing balance weight(s) or improperly seated or defective universal joint(s).