Corsica L4-134 2.2L (1991)
Governor: All Technical Service Bulletins
A/T - 3T40 Governor Failure Updated Part
BULLETIN NO.: 9173T40-02
CORP.REF.NO.: 177109
DATE: March 1991
TRANSAXLE APPLICATIONS:
1991 HYDRA-MATIC 3T40 Transaxle
TRANSAXLE MODELS:
AYC, KDC, KXC, LYC, PNC, TRC
SUBJECT:
Idle RPM Surge on Deceleration and/or Cruise Control Speed Fluctuation and/or Vehicle Speed Erratic (1-5 MPH). No Upshift. (Applecored or Worn
Governor Driven Gear)
VEHICLE APPLICATIONS:
J, L, N and W-Cars
BULLETIN COVERS:
A new governor assembly (4) 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 1-5 MPH). These 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 ACTION:
If any of the above mentioned conditions exist, replace the entire governor assembly with a New High Glass content governor, transaxle fluid strainer
(33) and seal (32) assembly. 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 (679) but will not affect
transaxle durability.
SERVICE PARTS INFORMATION:
Whenever ordering the New High Glass Content governor refer to the following part number:
DESCRIPTION
MODEL AND PART NUMBER
Governor Assembly
AYC 8682985
Governor Assembly
KDC 8682987
Governor Assembly
KXC 8682989
Governor Assembly
LYC 8682991
Governor Assembly
PNC 8682993
Governor Assembly
TRC 8682995
* 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.
