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Re: Installed 700R4 - Hook Up Lockup or not?
TCI has a vacuum switch (runs on same vac as th400 modulator). This sends signal to 4th gear lock up solenoid. It also unlocks based on vac. It works on negative side of circuit by grounding or un-grounding. You still need a cruise control brake release switch so converter will on lock when you run up on traffic and hit the brakes. No toggle switches involved.
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