A/T - Leak At Structural Side Cover Pan

Group Ref.: Transmission
Bulletin No.: 377139
Date: February, 1994

SUBJECT:
TRANSAXLE FLUID LEAK AT STRUCTURAL SIDE COVER PAN (INSTALL REPLACEMENT SERVICE GASKET)

MODELS:
1994 BUICK SKYLARK, REGAL
1994 CHEVROLET BERETTA, CORSICA, LUMINA
1993-94 OLDSMOBILE CUTLASS SUPREME
1994 OLDSMOBILE ACHIEVA
1994 PONTIAC GRAND AM, GRAND PRIX

TRANSAXLE APPLICATIONS:
1993-94 HYDRA-MATIC 4T60-E (RPO M13)

TRANSAXLE MODELS:
3BHW, 4AFW, 4BLW, 4CLW 4CWW, 4PBW, 4PHW, 4WBW, 4WSW WITH A STRUCTURAL (CAST ALUMINUM) SIDE COVER PAN, AND TRANSAXLE CASE I.D. 723








CONDITION: (Figure 1 and 2)
Some owners may experience an automatic transaxle fluid leak between the structural side cover pan and transaxle case.





CAUSE: (Figure 3)
A casting change was implemented to transaxle case i.d. 723 which reduced the thickness of a section of case wall affecting the side cover gasket's sealing ability when used with a structural cover pan.

CORRECTION:
Replace the original case side cover gasket with a new replacement service gasket. The replacement gasket listed below should only be used on 1993-94 4T60-E transaxles that contain a structural side cover pan, case i.d. 723 and an external side pan leak.

NOTE:
This bulletin only pertains to vehicles that contain a structural side cover and case i.d. 723. External leaks on transaxles that contain a stamped (steel) side cover pan or transaxles with structural side covers and case i.d.'s other than 723 should refer to the appropriate service manual (Section 7A Automatic Transaxle On-Vehicle Service) for information regarding fluid leak diagnosis.





SERVICE PART INFORMATION:

Parts are expected to be available on January 10, 1994.

WARRANTY INFORMATION:

For vehicles repaired under warranty, use:

Labor Operation: K6540

Labor Time: Use published labor operation time.