Re: Riddle me this? Parts ?????
it's not likely if it goes to the back of the trans. IT IS the vacuum modulator, and it controls the part throttle or wide open throttle shift points, I forget which, I know if you have it unplugged it's supposed to take forever to shift gears and when it does it shifts hard. it also helps the transmission to know what kind of vacuum the engine has like being under load and what not.
The actual passing gear/kickdown is done by the cable.
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