Suburban 2WD V8-5.3L (2008)
Torque Converter: Customer Interest
A/T - Shift Flare/Harsh 2-3 Shifts/Harsh Park To Drive
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