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.