NEW GOVERNOR SCREEN ADDED TO CASE INFORMATION

MODELS AFFECTED: SOME 1989 VEHICLES EQUIPPED WITH THM 440-T4/HYDRA-MATIC 4T60 TRANSAXLES

BULLETIN COVERS

A new Governor Screen (3) was added to the Governor Shaft Sleeve in the Case. The Governor Screen will minimize the potential of sediment entering the Governor Assembly and preventing the Governor Balls from seating properly.

SERVICE ACTION (Figure 2)

A machining change in the Case to provide clearance for the Screen will not permit installation of the Screen in past model Cases.

Important: Do not attempt to drill previous design Cases in order to install a Governor Screen due to critical dimensions.

DATE OF PRODUCTION CHANGE (Figure 1)

The new Governor Screen will be used on some models for production starting November 30, 1988 (Julian Date 335) and will be used on all models December 5, 1988 (Julian Date 340).

SERVICE NOTES

This is the same Governor Screen as used in the THM 125C/HYDRA-MATIC 3T40.

SERVICE PARTS INFORMATION

Part No Description Model Year - Model Usage ------- ----------- ------------------------ 8660770 Sleeve and Screen 1989-1/2 All Assembly, Governor Shaft

8631328 Sleeve, Governor Shaft 1984-89-1/2 All (no screen)

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.