LO-REV CLUTCH RATTLE/CLICKING IN 3RD GEAR-NEW FIBER PLATES

1989 A,J,L,N CARS

Bulletin Covers:

An intermittent rattle and/or clicking noise caused by Lo- Reverse parallel grooved fiber plates in 1989 THM 125C/HYDRA-MATIC 3T40 transaxles. This noise is most evident in the 3rd gear range.

DATE OF PRODUCTION CHANGE: (Figures 1 and 2) ------------------------- New smooth surface fiber plates for the Lo-Reverse clutch went into Production May 5, 1989, (Julian Date 125), for Willow Run built HYDRA-MATIC 3T40 transaxles and May 15, 1989, (Julian Date 135) for Windsor built HYDRA-MATIC 3T40 transaxles.

SERVICE ACTION:

If a customer comments about a rattle and/or clicking noise condition in any THM 125C/HYDRA-MATIC 3T40 transaxle, the Lo-Reverse fiber plates should be replaced with new smooth surface fiber plates.

SERVICE PARTS INFORMATION:

When ordering new Lo-Reverse fiber plates for this condition refer to the following part numbers:

Part Number Package Description ----------- ------------------- 8665960 Overhaul Kit

8666667 Lo-Rev Clutch Pack

SERVICE MANUAL REFERENCE:

Whenever servicing any THM 125C/HYDRA-MATIC 3T40 transaxle refer to the procedures outlined in the Unit Repair Section of your Service Manual.

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.