I believe I see what you mean John. With the solenoid wire unhooked at the rear of the trans it will still have the lock-up work because the solenoid is closed keeping the bleed closed when unhooked. I just always looked at it as an electrical lock-up since a solenoid was in the circuit and I figured the solenoid was open when off and closed upon start up and then opened when comanded by the PCM. Which says I was wrong and it should work with the wire unhooked since the solenoid is closed when unhooked. Ron