GM Cutlass RWD 1970-1987 Repair Guide

Driveshaft Balancing

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This service should only be performed if you have access to a proper lift or hoist.

  1. Place the car on a twin post hoist so that the rear of the car is supported on the rear axle housing and the rear wheels are free to rotate. Remove both the rear wheels and reinstall wheel lug nuts with the flat side next to the drum.
  2.  
  3. Mark and number the driveshaft at four points 90° apart at the rear of the shaft just forward of the balance weight.
  4.  
  5. Install two hose clamps on the rear of the shaft and slide them rearward until they stop at the nearest balance weight welded to the tube. Align both clamps to any one of the four marks and tighten them.
  6.  


CAUTION
NEVER run an engine in an unventilated area. Always open windows and doors, and use fans or power vents. Carbon Monoxide poisoning is deadly, DON'T take the risk.

  1. Run the car through the speed range of 50-55 mph (89 kmph). Note the amount of imbalance.
  2.  


CAUTION
Never run the car higher than 55 mph (89 kmph). Also, everyone should stay clear of the area to avoid possible injury. Do not run the car for long periods of time on the lift due to danger of overheating the engine or transmission.

  1. Loosen the clamps and rotate clamp heads 90° to the next mark on the shaft. Tighten the clamps and repeat Step 4.
  2.  
  3. Repeat Step 5 until the car has been run with clamps heads at all four marks on the shaft.
  4.  
  5. Position the clamps at the point of minimum imbalance. Rotate the clamp heads away from each other 45°. Run the car and note if imbalance has improved.
  6.  
  7. Continue to rotate the clamps apart at smaller angular increments until the balance is best.
  8.  
  9. Install the wheels and road test the car for a final check. Vibration felt on the lift may not show up on the road test. If the balance is not improved, replace the driveshaft.
  10.  

 
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