Skylark L4-151 2.5L (1991)
Governor: Customer Interest
A/T - Surge On Deceleration/No Upshift
Bulletin:
91-73T40-5
Date:
April, '91
Ref. No.: 91-148-73T40
Corp. Ref. No.: 177109
SUBJECT:
ENGINE SURGE ON DECEL, VEHICLE SPEED ERRATIC WITH CRUISE ON OR NO UPSHIFT (NEW GOVERNOR ASSEMBLY)
MODELS AFFECTED: 1991 SKYLARK MODELS
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 deceleration, surge with cruise control engaged or Vehicle speed erratic (range of 1 to 5 MPH). These conditions may be caused by
worn teeth (thin) on the governor driven gear.
^
No upshift and 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 and seal, transaxle fluid strainer and bottom pan gasket. This new
high glass content governor may be used on transaxles 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:
*Description
Engine Application
Model
Part Number
Governor Assembly
2.3L Quad 4 (VIN D)
KDC
8682987
" "
2.5L L4 (VIN U)
PNC
8682993
* Each governor package also contains a filter, multi-lip seal and bottom pan gasket.
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Refer to the On-Vehicle Service Section of your Service Manual whenever replacement of a governor assembly is necessary.
WARRANTY INFORMATION:
Operation No.
Description
Labor Time
K6430
Governor Assembly -
.2 hr.
R&R or Replace
K6500
Pan and/or Gasket
.6 hr.
Transaxle Oil - Replace
