Practice question

A school bus Allison applies lockup but immediately drops out and reapplies repeatedly (cycling) at steady cruise. The MOST likely cause is:

  1. A bent axle shaft
  2. A worn U-joint
  3. A plugged fuel filter
  4. A worn lockup clutch or marginal apply pressure causing unstable engagement

Answer: D — A worn lockup clutch or marginal apply pressure causing unstable engagement

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