NEW GASKETS: TRANSAXLE OIL PAN AND VALVE BODY COVER

FOR THM 125C TRANSAXLE

Beginning June 6, 1985, or Julian Date 157, all models of the THM 125C transaxles are being produced using new gaskets for the oil pan and valve body cover. The new gaskets have been improved to better withstand specified torque applications and reduce potential transaxle fluid leaks.

Hydra-matic Division requests and authorizes that all dealer inventory of the following packages be returned to WDDGM for credit.

Package No. Description ----------- ----------- 8631338 Transaxle Oil Pan Gasket 8631340 Transaxle Valve Body Cover Gasket

THM 125C transaxles built prior to September, 1983 (1984 model year, Julian Date 244) refer to Product Service Bulletin 83-I-149A for proper service procedures. THM 125C transaxles built after September, 1983 used a new oil pan and valve body cover. When servicing these transaxles for oil pan and/or valve body cover leaks, refer to the following procedure:

SERVICE PROCEDURE

1. Diagnose source of fluid leak to be certain leak is from the transaxle oil pan and/or valve body cover (refer to the correct Service Manual section). 2. If leak is determined to be from the transaxle oil pan and/or valve body cover area: A. Remove the oil pan and/or valve body cover. B. Clean the case, oil pan and/or valve body cover faces (with solvent) and visually inspect for damage and/or presence of RTV (Room Temperature Vulcanizing) sealant. C. Make sure all RTV sealant is removed from the case, oil pan and/or valve body cover faces. 3. Replace the past transaxle oil pan and/or valve body cover gasket(s) with:

Package No. Quantity Description ----------- -------- ----------- 8660038 1 Transaxle Oil Pan Gasket 8660039 1 Transaxle Valve Body Cover Gasket

4. When replacing the oil pan and/or valve body cover, it is critical that a torque wrench is used to tighten the hex head screws. Hand torque all hex head screws 12-16 N.m (9-12 ft. lbs.).

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.