A truck has a vibration that increases with road speed. Technician A says an out-of-balance driveshaft could be the cause. Technician B says incorrect driveshaft phasing could be the cause. Who is right?

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Both Technician A and B. Both issues can cause vibration that increases with road speed. An out-of-balance driveshaft creates a rotating imbalance, while incorrect phasing between driveshaft sections creates a cyclical vibration.

A truck has a vibration that increases with road speed. Technician A says an out-of-balance driveshaft could be the cause. Technician B says incorrect driveshaft phasing could be the cause. Who is right?

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