REVISED SPACER PLATE (REMOVAL OF 3-2 HIGH SPEED ORIFICE)

BULLETIN COVERS:

A REVISED SPACER PLATE FOR THE 1989 THM 700-R4/HYDRA-MATIC 4L60 MPM, MWM, MZM, TUM AND TXM MODELS (5.7L TRUCK MODELS). THE CHANGE IN THIS SPACER PLATE IS THE REMOVAL OF THE 3-2 HIGH SPEED ORIFICE FOR OPTIMUM 3-2 DOWNSHIFT TIMING (REFER TO FIGURE 1). NO CHANGES WERE MADE TO OTHER CALIBRATION ITEMS.

DATE OF PRODUCTION CHANGE: (FIGURE 2)

BEGINNING DECEMBER 15, 1988 (JULIAN DATE 350), THE 1989 5.7L TRUCK MODELS WERE BUILT WITH THE REVISED SPACER PLATE.

SERVICE PARTS INFORMATION:

THE PART NUMBER FOR THIS SPACER PLATE DID NOT CHANGE. THE PHYSICAL APPEARANCE CHANGED DUE TO THE REMOVAL OF THE 3-2 HIGH SPEED ORIFICE.

THE REVISED SPACER PLATE CAN BE USED TO SERVICE ANY 1989 THM 700-R4/HYDRA-MATIC 4L60 MPM, MWM, MZM, TUM, OR TXM MODEL.

PART NUMBER DESCRIPTION

8673139 SPACER PLATE - 1989 MODELS: 9MPM, 9MWM, 9MZM, 9TUM, 9TXM

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.

COPYRIGHT 1989 HYDRA-MATIC DIVISION, GENERAL MOTORS CORPORATION. ALL RIGHTS RESERVED.