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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 237 (Automatic Transmission - 4L80-E/4L85-E (Service & Replacement)) >> Diagnostic Information and Procedures >> Flexplate/Torque Converter Vibration Test >> Isolating Vibration

Isolating Vibration

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To isolate and correct a flywheel or torque converter vibration, separate the torque converter from the flywheel to determine if vibration is in the engine or transmission.

  1. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.
  2. Turn the engine OFF.
  3. Raise and suitably support the vehicle.
  4. Remove the transmission converter cover bolts and the cover.
  5. Mark the relationship of the converter to the flywheel.
  6. Remove the bolts attaching the converter to the flywheel.
  7. Slide the torque converter away from the flywheel.
  8. Rotate the flywheel and torque converter to inspect for defects or missing balance weights.

    Refer to ENGINE FLYWHEEL CLEANING AND INSPECTION .

  9. Lower the vehicle.
  10. With the engine at idle speed and the transmission in PARK or NEUTRAL, observe the vibration.
  11. Turn the engine OFF.
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