REUSABLE BOTTOM PAN GASKET (GENERAL INFORMATION)

Subject: REUSABLE BOTTOM PAN GASKET (GENERAL INFORMATION)

Models Affected: 1991-93 BONNEVILLE, GRAND PRIX AND TRANS SPORT MODELS WITH 4T60/4T60-E TRANS

TRANSAXLE APPLICATIONS: 1991-1993 HYDRA-MATIC 4T60 (RPO M13) 1991-1993 HYDRA-MATIC 4T60-E (RPO ME9)

TRANSAXLE MODELS: ALL

SERVICE INFORMATION: (Figure 1 and 2)

The HYDRA-MATIC 4T60/4T60-E transaxle controlled compression bottom pan gasket (23/63) is reusable. This gasket can be identified by its rubber-like texture and metal frame (black in color). The controlled compression gasket can only be used with a transaxle bottom pan having a flat face along the pan rail.

NOTE: The controlled compression bottom pan gasket went into production on June 24, 1991 (julian Date 175) for all 4T60 transaxles. (Refer to Pontiac Service Bulletin 92-7-6 issued 2/92 for further information.)

The controlled compression bottom pan gasket went into production at the start of production for all 4T60-E transaxles.

When removing the bottom pan, (24/59) it is recommended to inspect the gasket for any possible leak points that may cause future concerns:

o Cuts or tears in the rubber bead

o Correct bottom pan bolt torque

- crushed due to over-torque

- leaking due to low-torque

If no discrepancies are found, wipe gasket with clean cloth and case and pan area with part solvent. Reinstall gasket and check for leaks using powder or black-light and dye method. (Refer to the appropriate service manual "Section 7A General Information and On-Vehicle Service" for information regarding fluid leak diagnosis.)

IMPORTANT: The reusable bottom pan gasket for 4T60 and 4T60-E transaxles application should not be replaced during unit repair. The gasket should only be replaced when:

o Rubber bead is cut, crimped, or crushed

o Evidence of fluid seepage (with proper fastener torque)

Replacing a perfectly good, reusable gasket only adds an unnecessary expense to the repair.

SERVICE PART INFORMATION:

(4T60 Information)

Part Description Illust. Number Service Part No. ---------------- -------------- --------------- Transaxle Bottom Pan Gasket 63 8678681 (Controlled Compression)

(4T60-E Information)

Part Description Illust. Number Service Part No. ---------------- -------------- --------------- Transaxle Bottom Pan Gasket 54 8676250 (Controlled Compression)

Parts are currently available from GMSPO.

WARRANTY INFORMATION:

Labor Operation No.: K6500

Labor Time: Use Appropriate Labor Time

SERVICE MANUAL REFERENCE:

Refer to the appropriate Service Manual for the proper replacement procedure.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.