Engine - Surge/Erratic Cruise Control Speed

91oldsmobile04

NUMBER: 91-T-111

CORP.REF.NO: 177109

DATE: May 1991

SECTION: 7A, 3T40


SUBJECT ENGINE SURGE ON DECELERATION, VEHICLE
SPEED VARIES 1 TO 5 MPH W/CRUISE ON, NO UPSHIFT, REPLACE GOVERNOR ASSEMBLY

MODELS/YEARS 1991 CUTLASS CALAIS AND CUTLASS SUPREME
EQUIPPED WITH HYDRA-MATIC 3T40 TRANSAXLE (RPO-MD9)


This bulletin covers a new governor assembly which contains a high glass content driven gear. Some owners of 1991 vehicles equipped with HYDRA-MATIC 3T40 transaxles may comment on one or more of the following conditions:
^ Engine Surge on Deceleratlon, Surge with Cruise Control Engaged or Vehicle Speed Erratic (range of 1 to 5 MPH). These may be caused by teeth worn thin on the governor driven gear.
^ No Upshift or Stuck in First Gear. These conditions are caused by an applecored governor driven gear.


SERVICE PROCEDURE:
If any of the above mentioned conditions exist, replace the entire governor assembly with a new high glass content governor, transaxle fluld strainer and seal assembly. This new high glass content governor should only be used on 1991 transaxles with the above condition(s) built prior to December 14, 1990 (Julian Date 348). This new high glass content governor driven gear may cause a polished look on the governor drive gear located on the Final Drive but will not affect transaxle durability.


SERVICE PARTS INFORMATION:
Whenever ordering the new high glass content governor, refer to the following part numbers:

Model Part Number

AYC 8682985
KDC 8682987
KXC 8682989
LYC 8682991
PNC 8682993
TRC 8682995

Each governor package also contains a filter, multi-lip seal and bottom pan gasket. Parts are currently available from GMSPO.