Hello
The easiest way to hook up the lock up converter.
Run a fused hot wire to break pedal switch, it's a two way one contacts for the brake pedal are N.O.
The contacts for torque converter are N.C.
From the switch go to vacuum switch then to trans. Use a turbo 400 case connector it's a single wire.
In trans throw away all the pressure switchs, Get a N.O. pressure switch.
When trans shifts into 4th the pressure circuit will close switch that will send voltage to T.C. solenoid to dump
trans fluid to apply lock up .
The end of the input shaft feeds trans fluid to torque converter to pull off lock up clutch.
go to wrecking yard and look for wiring and brake switch .
Have fun. I've done about 50 trans this way.
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