Vibration Analysis - Driveline

Vibration Analysis - Driveline

Test Description

The numbers below refer to the step numbers in the diagnostic table.
8. In most cases, the vibration can be reproduced in the stall, but it is either not as bad or a lot worse than experienced on the road. This is normal. The cause of first-order driveline vibrations is usually due to excessive runout or the imbalance of a component. The In-Stall test will help determine which component needs to be repaired or replaced.
9. If the vehicle has a vibration that is equal to first-order driveline rotation, and it is not present when testing the vehicle in the stall, then it is possible that the vibration is being generated by internal rear axle components. This may also be true if the vibration was correctable in the stall but returned when the vehicle was driven on the road.
11. First-order driveline vibrations can be caused by excessive runout of the propeller shaft.
15. First-order driveline vibrations can be caused by excessive runout of the pinion flange. If a propeller shaft has excessive runout at the pinion flange only, and re-indexing the propeller shaft 180 degrees does not correct the condition, measure and correct the pinion flange runout before replacing the propeller shaft.
17. Re-indexing the propeller shaft to the pinion flange aligns the runout of components which may reduce vibration. If vibration is not reduced or eliminated, return the components to their original positions.