TCC - Elimination of the Valve Train
Model Year 1983Bulletin No. 83-146
File In Group 70
Number 21
Date July '83
SUBJECT: ELIMINATION OF THE [1][2]TORQUE CONVERTER CLUTCH VALVE TRAIN
MODELS AFFECTED: 1982 AND 1983 THM 200-4R TRANSMISSIONS
FIGURE 1 - PAST DESIGN CONTROL VALVE ASSEMBLY WITH T.C.C. VALVE TRAIN:
FIGURE 2 - NEW DESIGN CONTROL VALVE ASSEMBLY WITH T.C.C. VALVE TRAIN ELIMINATED:
Beginning late in the 1982 model year, the THM 200-4R transmission control valve assemblies were changed to eliminate the [1][2]Torque Converter Clutch Valve Train (Figure #1). The computer command control unit (C-3) controls the converter clutch making the T.C.C. Valve Train unnecessary. The new control valve assembly (Figure #2) will have a solid bushing in it to direct oil flow.
When servicing any 1982 or 1983 THM 200-4R transmission that has a C-3 system (all except diesel and Canadian models), it is important that the proper spacer plate and gaskets be used. Refer to the following charts for proper usage.
1982 THM 200-4R
Transmission Control Valve Assembly, Spacer
Model Plate & Gasket Service Package
BY 8634977
OG 8634978
1983 THM 200-4R
Transmission Control Valve Gasket Spacer
Model Assembly Package Plate
BY 8639133 8634969 8639023
OG 8639218 8634969 8639026
FIGURE 3 - NEW DESIGN GASKET:
FIGURE 4 - NEW DESIGN SPACER PLATE:
SERVICE INFORMATION
The spacer plate and gaskets are included in the 1982 service packages to prevent mixing of the new and past design spacer plates. New gaskets (Figure #3) can be used with new and past design control valve assemblies. New spacer plates (Figure #4) cannot be used with past design control valve assemblies.
FIGURE 2 - NEW DESIGN CONTROL VALVE ASSEMBLY WITH T.C.C. VALVE TRAIN ELIMINATED:
Location of the solid bushing is important. Locate the bushing so that the coiled pin fits into the groove of the bushing (Figure #2).