A/T - 3T40 Surging on Deceleration/Stuck in 1st Gear

91pontiac04

Bulletin Number: 91-7-29
Reference Number: 177109
Publish Date: 3/91


Subject:
ENGINE SURGE ON DECEL, VEHICLE SPEED ERRATIC W/CRUISE ON-RANGE OF 1-5 MPH, NO UPSHIFT (GOVERNOR ASSEMBLY)

Models Affected:
1991 SUNBIRD, GRAND AM AND GRAND PRIX MODELS


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 of 1 to 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 PROCEDURE:

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 numbers:


*Description Model Part Number

Governor Assembly 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.

SERVICE MANUAL REFERENCE:

Refer to the On-Vehicle Service Section of your Service Manual whenever replacement of a governor assembly is necessary.