Practice question

A school bus Allison transmission shudders during the lockup-clutch apply, and fluid analysis shows the wrong (non-TES-approved) fluid was installed. The correct action is to:

  1. Add a friction additive and ignore the spec
  2. Increase idle speed permanently
  3. Disconnect the lockup solenoid
  4. Drain and refill with the correct TES-approved fluid and reevaluate

Answer: D — Drain and refill with the correct TES-approved fluid and reevaluate

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