A/T - Shift Flare/Harsh 2-3 Shifts
TECHNICALBulletin No.: 09-07-30-004
Date: January 27, 2009
Subject:
Flare and/or Harsh 2-3 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, Yukon Denali, Yukon XL Denali
2008-2009 GMC Yukon XL
2009 GMC Yukon
Equipped with 6L80 (RPO MYC) or 6L90 (RPO MYD) Automatic Transmission
Condition
Note:
Vehicles built in the January through August, 2007 time frame are more likely to have leaking fluid seal rings.
Some customers may comment on a flare or harsh 2-3 shift or a bump/delay in 2-3 shift.
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.
Parts Information
Warranty Information
Disclaimer