Source reference 10137776
Manufacturer communication — 2006 GMC YUKON DENALI XL
Relation to the target vehicle
- The source's vehicle field includes the trim.
- Model year
- Match 2006 — Source vehicle field
- Model
- Match YUKON DENALI XL — Source vehicle field
- Trim
- Match Denali — Source vehicle field
What the manufacturer’s document says
01-07-30-042H ・ normal characteristic (no repair) ・ for GM vehicles in general
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).
the passage
2014 and Prior GM Passenger Cars and Light Duty Trucks Equipped with 4L60-E, 4L65-E or 4L70-E Automatic Transmission (RPOs M30, M32, M70)
Fault
A clunk noise can be heard on a 2-3 upshift or a 3-2 downshift.
the passage
Some vehicles may exhibit a clunk noise that 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.
the passage
This condition may be more pronounced on a 4-wheel drive vehicle due to the additional tolerances in the transfer case.
Finding 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 passage
During a 2-3 upshift, the 2-4 band is released and the 3-4 clutch is applied. The timing of this shift can cause a momentary torque reversal of the output shaft that results in a clunk noise.
The same torque reversal can occur on a 3-2 downshift, when the 3-4 clutch is released and the 2-4 band applied.
the passage
This same torque reversal can also occur on a 3-2 downshift when the 3-4 clutch is released and the 2-4 band applied.
Correction
Caution
For 2005 model year fullsize utilities and pickups, refer to Corporate Bulletin Number 05-07-30-012.
the passage
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.
the passage
This is a normal condition. No repairs should be attempted.
Compiled by reading the full text of the document; each point stands on the passage shown. Check the document itself, linked below, before working on a vehicle.
Stated content
Communication summary
本情報は、2-3アップシフト時および3-2ダウンシフト時のクランク音が、アップシフト時の2-4バンドのリリースと3-4クラッチ ASSY の作用により発生すること、また3-2ダウンシフト時には3-4クラッチのリリースと2-4バンドの作用により、出力シャフトにトルク逆転が生じてクランク音が発生することを整備士に通知するために作成されたものです。これは正常な状態です。 Machine translation (unreviewed)
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.
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Source
- Source
- NHTSA Manufacturer Communications
- Source reference
- 10137776
- Received by source
- 2018-05-21
- Incident date
- Unknown
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