For 1990-2009 cars

# REUSABLE BOTTOM PAN GASKET (GENERAL INFORMATION)

#### SUBJECT: REUSABLE BOTTOM PAN GASKET (GENERAL INFORMATION)

#### MODELS AFFECTED: ALL 1991-93 MODELS WITH 4T60/4T60-E TRANSAXLES

SERVICE INFORMATION: (Figure I 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.

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.

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.