A/T - THM 200C Late Engagement or Slipping In Drive

Number 84-7-2 Date 10/83
Subject: 1984 THM 200C TRANSMISSION LATE ENGAGEMENT OR SLIPPING IN DRIVE

Figure 1:

Some early 1984 model THM 200C 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 (see Figure 1).
Other causes for late engagement or slipping in drive are low transmission oil level, cut or nicked forward clutch piston seals and/or cut or nicked Teflon turbine shaft seals.

This bulletin is for early 1984 model THM 200C transmissions. Refer to the chart below and verify serial and model numbers. If the serial number is prior to the number on the chart, then follow this procedure.

SERIAL
MODEL NUMBER
BH 54628
OI 21738
CZ 1041
JY 1075
OR 1119
OU 1727

Figure 2:

Figure 3:

SERVICE PROCEDURE

1. Check transmission oil level, correct if required.

2.. Visually inspect the forward clutch piston seals and turbine shaft Teflon(R) seals for cuts and nicks.

3. Using a 1/16" allen wrench, mark short end as illustrated in Figure 2 (shown below). Using the allen wrench as a gage, 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 the chart below:
HOUSING ASSEMBLY FORWARD CLUTCH TURBINE SHAFT
MODEL FORWARD CLUTCH PISTON SEALS SEALS (TEFLON))

CZ, JY 8633948 8628924
All Models 8628090
BH, OI 8638944 8628924
OR, OU