Analysis of Vibration

Analysis of Vibration

Few vibration conditions are caused by the rear axle. For a vibration concern, follow the diagnosis procedure in Vehicle/Testing and Inspection unless there is a good reason to suspect the axle.

Tires

WARNING: Do not balance the wheels and tires while they are mounted on the vehicle. Possible tire disintegration or differential failure could result, causing personal injury or extensive component damage. Use an off-vehicle wheel and tire balancer only.

Most vibration is caused by tires, driveline angle or driveline imbalance.

Vibration is a concern with modern, high-mileage tires if they are not "true" both radially and laterally. They are more susceptible to vibration around the limits of radial and lateral runout of the tire and wheel assembly. They also require more accurate balancing. Wheel and tire runout checks, trueing and balancing are normally done before axle inspection.

Driveline Imbalance
Driveline imbalance can be caused by excessive looseness in the driveshaft damaged driveshaft tubing, looseness or high runout at the driveshaft attachments. Excessive looseness in the driveshaft can be caused by CV joint or universal joint wear as well as loose fitting slip-yoke splines. Inspect and install new driveshaft components as necessary.