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

Model and Year: 1989 C, G, K, R, V TRUCKS WITH 700-R4 TRANSMISSION

TO: ALL CHEVROLET DEALERS

This 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.