A/T - Shift Flare/Harsh 2-3 Shifts/Harsh Park To Drive
TECHNICALBulletin No.: 09-07-30-004D
Date: June 30, 2011
Subject: Flare and/or Harsh 2-3 Shifts, Delayed/Extended or Delayed with Harsh Feel Initial Park to Drive and/or Reverse to Drive Shifts (Install Three Fluid Seal Rings)
Models:
2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2009 Chevrolet Silverado
2008-2009 Chevrolet Suburban
2009 Chevrolet Avalanche, Tahoe
2007-2009 GMC Sierra, Sierra Denali, Yukon Denali, Yukon XL Denali
2008-2009 GMC Yukon XL
2009 GMC Yukon
Equipped with 6L80 (RPO MYC) or 6L90 (RPO MYD) Automatic Transmission
Vehicles Built Prior to December 2008
Attention:
Vehicles built prior to December 2008 are more likely to have leaking fluid seal rings. Starting in November 2008, a new 2-piece seal was implemented. When the transmission pump is removed and a 2-piece seal is found, do not continue on with this bulletin. The guidelines of this bulletin will not apply to a 2-piece seal.
Supercede:
This bulletin is being revised to update the parts information. Please discard Corporate Bulletin Number 09-07-30-004C (Section 07 - Transmission/Transaxle).
Condition
Note
Vehicles built prior to December 2008 are more likely to have leaking fluid seal rings. Starting in November 2008, a new 2-piece seal was implemented. When the transmission pump is removed and a 2-piece seal (1) is found, do not continue on with this bulletin. The guidelines of this bulletin will not apply to a 2-piece seal.
Some customers may comment on any of the following conditions:
- Flare or harsh 2-3 shift
- Bump/delay in 2-3 shift
- Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts
Cause
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings. The following conditions are indications that the fluid seal rings may be leaking.
- Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts that are more likely to occur when the transmission temperature is below approximately 40°C (104°F).
- Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0°C (32°F) to 40°C (104°F) temperature range, but can be present at any temperature.
- Harsh 2-3 shifts that are more likely to occur at less than 50% throttle pressure.
Correction
Important
DO NOT replace the transmission control valve body, transmission control module (TCM) or transmission fluid pump cover assembly.
1. Verify the customer's concern with the described conditions above. Then replace the 1-2-3-4 and 3-5-R clutch fluid seal rings.
2. Remove the transmission assembly from the vehicle. Refer to Transmission Replacement in SI.
3. Remove the transmission oil pan. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement in SI.
Notice
When removing the transmission control valve body, discard the O-ring seals and install new seals, GM P/N 24236927. Failure to install control valve body O-ring seals may cause internal transmission leaks and transmission damage.
4. Remove the transmission control valve body. Refer to Control Valve Body Assembly/Removal in SI.
5. Remove the transmission bell housing / fluid pump. Refer to Torque Converter Housing with Fluid Pump Removal in SI.
Notice
The three clutch fluid seal rings are required to be installed in a specific way. Failure to install new clutch fluid seal rings may cause internal transmission leaks and transmission damage.
6. Inspect and remove the three clutch fluid seal rings (1). Install new pump rings, GM P/N 24248581. Refer to 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L80/90) in SI for correct installation.
7. After completing the repair procedure, a Service Fast Learn Adapts procedure must be completed. Refer to Service Fast Learn Adapts in SI for procedure details. After completing the Service Fast Learn Adapts procedure, the vehicle may still experience some minor driveability issues but should learn improved shifting performance over the next several key cycles and driving time. Review with the customer the facts about the transmission's ability to self-correct shifting issues or concerns. The transmission adapts are always functional and operate at transmission oil temperatures about 40°C (104°F).
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer
TECHNICAL
Bulletin No.: 09-07-30-004C
Date: January 13, 2011
Subject: Flare and/or Harsh 2-3 Shifts, Delayed/Extended or Delayed with Harsh Feel Initial Park to Drive and/or Reverse to Drive Shifts (Install Three Fluid Seal Rings)
Models:
2007-2009 Cadillac Escalade, Escalade ESV, Escalade EXT
2007-2009 Chevrolet Silverado
2008-2009 Chevrolet Suburban
2009 Chevrolet Avalanche, Tahoe
2007-2009 GMC Sierra, Sierra Denali, Yukon Denali, Yukon XL Denali
2008-2009 GMC Yukon XL
2009 GMC Yukon
Equipped with 6L80 (RPO MYC) or 6L90 (RPO MYD) Automatic Transmission
Vehicles Built Prior to December 2008
Attention:
Vehicles built prior to December 2008 are more likely to have leaking fluid seal rings. Starting in November 2008, a new 2-piece seal was implemented. When the transmission pump is removed and a 2-piece seal is found, do not continue on with this bulletin. The guidelines of this bulletin will not apply to a 2-piece seal.
Supercede:
This bulletin is being revised to update the models involved and add Condition information. Please discard Corporate Bulletin Number 09-07-30-004B (Section 07 - Transmission/Transaxle).
Condition
Note
Vehicles built prior to December 2008 are more likely to have leaking fluid seal rings. Starting in November 2008, a new 2-piece seal was implemented. When the transmission pump is removed and a 2-piece seal (1) is found, do not continue on with this bulletin. The guidelines of this bulletin will not apply to a 2-piece seal.
Some customers may comment on any of the following conditions:
- Flare or harsh 2-3 shift
- Bump/delay in 2-3 shift
- Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts
Cause
This condition may be caused by leaking 1-2-3-4 and 3-5-R clutch fluid seal rings. The following conditions are indications that the fluid seal rings may be leaking.
- Delayed/extended or delayed with harsh feel initial Park to Drive and/or Reverse to Drive shifts that are more likely to occur when the transmission temperature is below approximately 40°C (104°F).
- Harsh or flaring 2-3 shifts that are more likely to occur when the transmission fluid temperature is in the approximately 0°C (32°F) to 40°C (104°F) temperature range, but can be present at any temperature.
- Harsh 2-3 shifts that are more likely to occur at less than 50% throttle pressure.
Correction
Important
DO NOT replace the transmission control valve body, transmission control module (TCM) or transmission fluid pump cover assembly.
1. Verify the customer's concern with the described conditions above. Then replace the 1-2-3-4 and 3-5-R clutch fluid seal rings.
2. Remove the transmission assembly from the vehicle. Refer to Transmission Replacement in SI.
3. Remove the transmission oil pan. Refer to Automatic Transmission Fluid, Fluid Pan and/or Filter Replacement in SI.
Notice
When removing the transmission control valve body, discard the O-ring seals and install new seals, GM P/N 24236927. Failure to install control valve body O-ring seals may cause internal transmission leaks and transmission damage.
4. Remove the transmission control valve body. Refer to Control Valve Body Assembly/Removal in SI.
5. Remove the transmission bell housing / fluid pump. Refer to Torque Converter Housing with Fluid Pump Removal in SI.
Notice
The three clutch fluid seal rings are required to be installed in a specific way. Failure to install new clutch fluid seal rings may cause internal transmission leaks and transmission damage.
6. Inspect and remove the three clutch fluid seal rings (1). Install new pump rings, GM P/N 24238248. Refer to 1-2-3-4 and 3-5 Reverse Clutch Fluid Seal Ring Installation (6L80/90) in SI for correct installation.
7. After completing the repair procedure, a Service Fast Learn Adapts procedure must be completed. Refer to Service Fast Learn Adapts in SI for procedure details. After completing the Service Fast Learn Adapts procedure, the vehicle may still experience some minor driveability issues but should learn improved shifting performance over the next several key cycles and driving time. Review with the customer the facts about the transmission's ability to self-correct shifting issues or concerns. The transmission adapts are always functional and operate at transmission oil temperatures about 40°C (104°F).
Parts Information
Warranty Information
For vehicles repaired under warranty, use the table.
Disclaimer