TSB Document:

• SB-10105819-9430.pdf

Affected Component: POWER TRAIN:TRANSFER CASE (4-WHEEL DRIVE)

Summary

"SITUATION: A RUBBING/SCRAPING/DRONE-TYPE NOISE AND/OR A VIBRATION MAY APPEAR TO BE EVIDENT FROM THE FRONT LEFT-HAND CORNER OF THE VEHICLE. THE NOISE MAY ALSO BE DESCRIBED AS SIMILAR TO A BRAKE RUBBING OR WHEEL BEARING NOISE AND CAN BE VARIABLE FROM VEHICLE TO VEHICLE. THE ISSUE CAN OCCUR AT DIFFERENT SPEEDS/GEARS AND IN STEADY STATE DRIVING CONDITIONS UP TO 50/60MPH (80/100KM/H). THE NOISE IN MOST CASES IS MORE PROMINENT IN SECOND GEAR COAST DOWN, PARTICULARLY AROUND 12MPH (20KM/H). TO CONFIRM THE TRANSFER CASE IS THE ROOT CAUSE, THE NOISE CAN LISTENED TO USING A ‘CHASSIS EAR’ FIXED TO FRONT DIFFERENTIAL RIGHT-HAND MOUNT. CAUSE: THIS MAY BE CAUSED BY A CHORDAL VIBRATION OF THE TRANSFER CASE CHAIN ON COAST/OVERRUN."

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