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.
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.)
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.
Part Description Illust. Number Service Part No. ---------------- -------------- ---------------- Transaxle Bottom Pan Gasket 63 8678681 (Controlled Compression)
Part Description Illust. Number Service Part No. ---------------- -------------- ---------------- Transaxle Bottom Pan Gasket 25 8676250 (Controlled Compression)
For vehicles repaired under warranty use:
Labour Operation: K6500
Labour Time: Use the appropriate Labour Time Guide
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.