A/T - Delayed Neutral to Reverse Engagement
89Chevy25Number: 89-244-7A
Section: 7A
Date: September 1989
Corporate Bulletin No.: 977138
Subject: DELAYED NEUTRAL TO REVERSE ENGAGEMENT
Model and Year: 1988-89 B, F CARS WITH THM 200-4R AUTOMATIC TRANSMISSION
Figure 1 - Spacer Plate Identification Location:
TO: ALL CHEVROLET DEALERS
Information on design changes incorporated into 200-4R transmission valve body spacer plates. The Lo/Reverse orifice in the spacer plate has been enlarged to enhance Neutral to Reverse engagement performance (See Figure 1).
The revised spacer plates also include a new I.D. location. Previous spacer plates could not be identified while assembled in the transmission because the identification letters were obscured by the valve body. A tab has been added at a different location (shown in Figure 1) and the identification letters are now visible after assembly.
Figure 2 - THM 200-4R Transmission Identification Information:
All THM 200-4R models built after July 7, 1989 (Julian Date 188), were built using the revised spacer plate (See Figure 2).
The Lo/Reverse feed hole revision only affects THM 200-4R transmission models that were initially built with the Accumulated Neutral to Reverse Garage Shift Package (reference Dealer Service Bulletin 88-421-7A. Part numbers and identification letters have not changed. Therefore, when servicing a THM 200-4R spacer plate, order the usual part number and the replacement part will be the updated spacer plate.
Part Number Description Transmission Models
8669047 Spacer Plate (ID: CA) 8CZF
8669049 Spacer Plate (ID: CC) 8CHF
8669050 Spacer Plate (ID: CD) 8CRF
8669051 Spacer Plate (ID: CE) 8CCF
8669052 Spacer Plate (ID: CF) 8CYF
8669056 Spacer Plate (ID: CG) 9CTF, 9CUF
8669060 Spacer Plate (ID: CH) 8KTF, 9KJF, 9KTF
8669068 Spacer Plate (ID: TA) 9TAF
Parts are currently available from GMSPO.
SERVICE MANUAL REFERENCE:
Refer to the Unit Repair section of the THM 200-4R Service Manual for spacer plate removal and installation.