C 20 3/4 Ton Pickup 2WD V8-350 5.7L VIN L 4-bbl (1983)
Figure 2 - THM 700-R4/HYDRA-MATIC 4L60 Transmission Identification Information
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:
Past THM 700-R4 control valve assemblies that used the converter clutch throttle valve and sleeve (non-ECM controlled TCC apply) will be maintained
for service. Service control valve assemblies containing the converter clutch throttle valve and sleeve will continue to be available through GMSPO.
The THM 700-R4/HYDRA-MATIC 4L60 control valve assemblies built with the converter clutch bore plug (ECM controlled TCC apply) are
serviceable with the new control valve assembly. The new service control valve assemblies (no TCC bore) will supersede the appropriate applications as
current service stock is depleted.
