Firebird V8-305 5.0L (1982)
Valve Body: All Technical Service Bulletins
A/T - New Control Valve, Elimination of TCC Bore
Bulletin Number:
89-7-17
Reference Number:
877156
Publish Date:
1/89
FIGURE 1
Subject:
NEW CONTROL VALVE ASSEMBLY - ELIMINATION OF TCC BORE.
Models
Affected:
1982-1989 PARISIENNE/SAFARI AND FIREBIRD WITH 700-R4 TRANSMISSION
This is service information for new THM 700-R4/HYDRA-MATIC 4L60 control valve assemblies. The new control valve assembly will no longer have
the TCC bore, and now contains a "notch" in the channeling allowing 2nd Clutch oil into the TCC circuit (refer to Figure 1). The TCC bore, in the past,
has housed either the converter clutch throttle valve and sleeve or the converter clutch bore plug. The converter clutch throttle valve was used on models
that had non-ECM controlled TCC apply. The converter clutch bore plug was used on models that had ECM controlled TCC apply. Starting with 1989
production, all THM 700-R4/
FIGURE 2 - THM 700-R4/HYDRA-MATIC 4L60 TRANSMISSION IDENTIFICATION INFORMATION
HYDRA-MATIC 4L60 models are ECM controlled TCC apply. Since there are no current production models using the converter clutch throttle valve,
the TCC bore is not needed and has been eliminated.
DATE OF PRODUCTION CHANGE:
(Figure 2)
Starting on November 14, 1988, Julian Date 319, all THM 700-R4/HYDRA-MATIC 4L60 models use the new control valve assemblies.
SERVICE ACTION:
