TRANSAXLE FLUID LEAK AT CON. (INSTALL NEW HELIX CON. SEAL)

SUBJECT: TRANSAXLE FLUID LEAK AT HELIX CONVERTER SEAL - REPLACE TRANSAXLE WITH SRTA SERVICE REPLACEMENT TRANSMISSION ASSEMBLY) UNIT

MODELS/YEARS: 1991-93 VEHICLES EQUIPPED WITH HYDRA-MATIC 4T60-E TRANSAXLE (RPO-M13)

This bulletin is being revised to change the correction instructions. This bulletin cancels and supersedes Dealer Technical Bulletin 93-T-21 which should be discarded.

CONDITION: Some vehicles equipped with a 1991-93 HYDRA-MATIC 4T60-E (RPO M13) transaxle built on or before Julian Date 302 (October 28, 1992) may exhibit a fluid leak between the helix converter seal and its bore. Under some conditions the helix converter seal may walk-out partially or completely. Hot weather and/or extreme operating conditions are contributing factors to this concern.

CAUSE: The above condition may be due to the taper of the helix converter seal bore and cannot be repaired at a dealership level.

CORRECTION: Begin with the "Fluid Leak Diagnosis" ("Automatic Transaxle On-Vehicle Service Section of the applicable 1991-93 Service Manual") which provides a detailed procedure in locating and repairing vehicle leaks.

If it is determined the leak is from the helix converter seal, remove the transaxle assembly and replace it with a SRTA (Service Replacement Transmission Assembly).

SERVICE MANUAL INFORMATION: Refer to the 1991-93 Service Manual, Automatic Transaxle On-Vehicle Service Section 7A for proper On-Vehicle Service to remove and replace a HYDRA-MATIC 4T60- E transaxle.

WARRANTY INFORMATION:

Labor time should be charged under Operation Number K7000 for "Transaxle Assembly-Replace" from the appropriate 1991-93 Labor Time Guide.

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.