REUSABLE BOTTOM PAN GASKET (GENERAL INFORMATION)

SUBJECT: REUSABLE BOTTOM PAN GASKET (GENERAL INFORMATION)

VEHICLES AFFECTED: 1991-93 "A, C, E, H, K, W, V" MODELS AND "U" VAN WITH 4T60 (RPO M13) OR 4T60-E (RPO ME9) TRANSAXLE

SERVICE INFORMATION: (FIGURE 1 AND 2) ------------------------------------- The HYDRA-MATIC 4T60/4T60-E transaxle controlled compression bottom pan gasket (25/63) is reusable. This gasket can be identified by its rubber-like texture and metal frame (black in colour). 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 and THM F-7 transaxles. (Refer to Corp. bulletin Ref. No.: 177129* 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)

o 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 25 8676250 (Controlled Compression)

LABOUR TIME INFORMATION:

For vehicles repaired under warranty use:

Labour Operation: K6500

Labour Time: Use the appropriate Labour Time Guide

SERVICE MANUAL REFERENCE:

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

**BULLETIN REFERENCES: --------------------- Corporate Ref. 177129

General Motors of Canada 92-74T60-103

Chevrolet Division 92-9l-7A

Pontiac Division 92-7-6

Oldsmobile Division 92-T-35

Buick Division 92-74T60-4

Cadillac Division 92-1-30

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.