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GMC Yukon XL 2000–2006

GMC Yukon XLModel years 2000–2006

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Common on this vehicle:Noise

issue4L60-E / 4L65-E clunk on 2-3 upshift or 3-2 downshift (normal condition)Remove

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Known issues4L60-E / 4L65-E clunk on 2-3 upshift or 3-2 downshift (normal condition)1

  1. Manufacturer communication2005–2006 GMC YUKON XL ・ 2018-05-21

    2-3 Upshift and 3-2 Downshift Clunk Normal Condition

    1. 1Fault

      • A clunk noise can be heard on a 2-3 upshift or a 3-2 downshift.
      • The condition may be more pronounced on a 4-wheel drive vehicle because of the additional tolerances in the transfer case.

    2. 2Finding the cause

      Possible causes

      • During a 2-3 upshift the 2-4 band is released and the 3-4 clutch is applied; the timing of this shift can momentarily reverse the torque on the output shaft, which makes the clunk.
      • The same torque reversal can occur on a 3-2 downshift, when the 3-4 clutch is released and the 2-4 band applied.

    3. 3Correction

      Caution

      • For 2005 model year fullsize utilities and pickups, refer to Corporate Bulletin Number 05-07-30-012.
      • This is a normal condition; no repairs should be attempted.
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    From the manufacturer’s document

    • Applies to：Applies to 2014 and prior GM passenger cars and light duty trucks with the 4L60-E, 4L65-E or 4L70-E automatic transmission (RPOs M30, M32, M70).
    • Caution：For 2005 model year fullsize utilities and pickups, refer to Corporate Bulletin Number 05-07-30-012.
    • Condition：A clunk noise can be heard on a 2-3 upshift or a 3-2 downshift.
    • Cause：During a 2-3 upshift the 2-4 band is released and the 3-4 clutch is applied; the timing of this shift can momentarily reverse the torque on the output shaft, which makes the clunk.
    • Cause：The same torque reversal can occur on a 3-2 downshift, when the 3-4 clutch is released and the 2-4 band applied.
    • Condition：The condition may be more pronounced on a 4-wheel drive vehicle because of the additional tolerances in the transfer case.
    • Caution：This is a normal condition; no repairs should be attempted.

    Open the manufacturer’s document (PDF) ↗ The points above were read from this document.

    Remedy
    This information was created to inform the technician that the 2-3 upshift and the 3-2 downshift clunk is caused by the releasing of the 2-4 band and application of the 3-4 clutch assembly during an upshift. Also during a 3-2 downshift, the releasing of the 3-4 clutch during the application of the 2-4 band, can cause torque reversal down the output shaft creating a clunk. This is a normal condition.