A/T - Revised Spacer Plate Downshift Timing 3-2
89chevy13GMC NUMBER: 89-T-44
GROUP: 7A - Automatic Transmission
DATE: April, 1989
CORPORATE
NUMBER: 977105
SUBJECT: REVISED SPACER PLATE (REMOVAL OF 3-2 HIGH SPEED ORIFICE) 3-2 DOWNSHIFT TIMING
MODELS: 1989 700-R4 TRUCK SERIES: C,G,K,R,V
Figure 1 - Spacer Plate - 3-2 High Speed Orifice Removed:
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.
Figure 2 - THM 700-R4/HYDRA-MATIC 4L60 Transmission Identification Information:
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.