GM Service Manual Online
For 1990-2009 cars only

Perform a road test on the vehicle with the customer. The road test may help to identify many faulty parts such as:

    â€¢ Control arm bushings
    â€¢ Shock dampeners
    â€¢ Power steering gear mounts
    â€¢ Wheel bearings
    â€¢ Tires

Obvious conditions must be brought to the customer's attention before beginning an alignment. A waddle feeling in the back of the vehicle often indicates the occurrence of a bent rim and/or a belt shift in 1 of the rear tires. Vibration in the steering wheel or in the floor pan is often the result of static imbalance or radial runout of the front tires.