DELAYED NEUTRAL TO REV. ENGAGE REVISED SPACER PLATES

Model and Year: 1988-89 B, F CARS WITH THM 200-4R AUTOMATIC TRANSMISSION

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 lefters 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.

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.

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.