What is the most likely cause of a driveshaft vibration that occurs only at highway speeds under a load?

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Multiple choice — select the best answer

AIncorrect driveshaft length
BDamaged center support bearing mount
CMissing balance weights
DWorn U-joints

✓ Correct answer: D. Worn U-joints Worn U-joints are most likely to cause vibration under load at highway speeds because the increased torque exaggerates the movement in the worn components as they rotate.

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What is the most likely cause of a driveshaft vibration that occurs only at highway speeds under a load?

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