LATE ENGAGE/SLIP IN DRIVE/200C BLOCKED FOR. CLUTCH OIL HOLE

Models Affected: 1984 Regals Equipped with THM 200C Transmissions & 3.8L Engines (VIN Code A) or 4.3L Engines (VIN Code V)

Some 1984 Model THM 200C model "BH" or "OR" transmissions may experience a late engagement or slipping in drive range. This condition is usually detected while the transmission is cold, and could be caused by a blocked forward clutch feed orifice hole. (Figure 1).

If this condition is encountered on an early 1984 model THM 200C transmissions refer to the chart below and verify transmission model and serial number. If the serial number is prior to the number on the chart then follow service procedure shown below.

MODEL SERIAL NUMBER ----- ------------- BH 54628 OU 1727

SERVICE PROCEDURE:

1. Check transmission oil level and correct if required.

2. Disassembly transmission as necessary and visually inspect the forward clutch piston seals and turbine shaft teflon seals for cuts and nicks.

3. If these items are okay, mark the short end of a 1/16" allen wrench as illustrated in Figure 2 (shown below). Using the allen wrench as a gauge, insert the small end into the forward clutch feed orifice hole (See Figure #3) and make sure the allen wrench goes into the orifice hole (without any drag) until the mark on the wrench is flush with the ground diameter. (Refer to Figure #3).

If it is necessary to replace any of the parts listed in this bulletin refer to chart below:

Housing Assembly Forward Clutch Turbine Shaft Model Forward Clutch Piston Seals Seals (Teflon) ----- -------------- ------------ -------------- All Models BH,OU 8638944 8628924 8628090

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.