Torque Converter Clutch Valve Train - Servicing
Bulletin No. T 84-25AFile in Group 7
Number 91
Corp. Ref. No. 802 7921
Date July '85
SUBJECT: SERVICING THE [1][2]TORQUE CONVERTER CLUTCH VALVE TRAIN IN THM 200-4R AND 325-4L TRANSMISSIONS IN VEHICLES EQUIPPED WITH GASOLINE ENGINES
MODELS AFFECTED: 1982 DEVILLE, BROUGHAM, ELDORADO AND SEVILLE
This bulletin supersedes Serviceman Bulletin 84-25, which should be destroyed.
FIGURE 1 FIRST DESIGN CONTROL VALVE ASSEMBLY WITH T.C.C. VALVE TRAIN:
Early production 1982 Cadillacs equipped with gasoline engines and THM 200-4R or 325-4L transmissions were built with a Torque Converter Clutch (TCC) valve train installed in the control valve assembly of the transmission. This first design control valve assembly (refer to Figure 1) contains a bushing as well as converter clutch throttle and shift valves and a calibration spring.
FIGURE 2 SECOND DESIGN CONTROL VALVE ASSEMBLY WITH T.C.C. VALVE TRAIN ELIMINATED:
Beginning late in 1982 production, the TCC valve train was eliminated from the control valve assembly. For an interim period, the second design control valve assembly (refer to Figure 2) contained a hollow bushing to direct TCC signal oil flow. Service stock control valve assemblies no longer utilize the bushing or valve bore; casting changes have been incorporated that eliminate the need for the bushing.
Refer to the following service and parts information when servicing a 1982 THM 200-4R or 325-4L transmission. It is essential that the proper gaskets and spacer plate be used to assure proper transmission operation. On THM 200-4R applications, incorrect parts will result in reduced fuel economy, and a hard diagnostic code 39 on HT4100 equipped vehicles. On THM 325-4L applications, incorrect parts can result in poor shift quality.
This bulletin provides parts information for servicing first and second design control valve assemblies.
1. THM 200-4R (Deville and Brougham Series Vehicles) Service Information
^ First design control valve assemblies for the HT4100 and 4.1L V-6 applications are no longer available through GMWDD. If a first design control valve assembly requires replacement, it will be necessary to install a complete control valve assembly service package.
^ First and second design spacer plates are available for service when control valve replacement is not required.
FIGURE 3 NEW DESIGN GASKET:
FIGURE 4 FIRST DESIGN 200-4R SPACER PLATE:
FIGURE 5 SECOND DESIGN 200-4R SPACER PLATE:
^ The second design gasket package will service both first and second design components (refer to Figures 3, 4 and 5). All GMWDD stock of first design gaskets has been superseded by the second design gaskets.
1982 THM 200-4R, CONTROL VALVE ASSEMBLY SERVICE PARTS INFORMATION
First Design Second Design Control Valve
Trans Gasket Spacer Spacer Assembly Service
Engine Code Package Plate* Plate** Package***
4.1L V-6 BY 8634969 8634839 8657026 8634977
HT4100 AA & AP 8634969 8634792 8657010 8634981
*First design spacer plate, not to be used on second design control valve assembly. **Second design spacer plate, not to be used on first design control valve assembly. ***Contains second design control valve assembly, spacer plate and gaskets.
II. THM 325-4L (Eldorado and Seville)
Service Information
A. ^ On 4.1L V-6 applications, the complete service package and gasket package must be used when replacing a first design control valve assembly. The service package includes a second design control valve assembly, spacer plate, and a calibration update kit to improve shift quality (refer to Serviceman Bulletin 83-107). The service package DOES NOT include gaskets.
^ Do not use the first design spacer plate (identified by the letter "U" stamp) with the second design control valve assembly. The second design spacer can be used in both applications.
^ The gasket package will service first and second design components.
B. ^ On HT4100 applications, the second design control valve assembly is compatible with first design components.
1982 THM 325-4L, CONTROL VALVE ASSEMBLY SERVICE PARTS INFORMATION
Trans Control Valve Gasket Spacer Service
Engine Code Assembly Package Plate Package
4.1L V-6 AM N/A 8635982 8635648 8635938*
HT4100 AJ 8635955 8635982 8635640 N/A
*Contains second design control valve assembly, spacer plate, and calibration update kit (gaskets not included).