[pickupman]

I need some info and possibly some parts on the 67-69 Factory 3spd overdrive trannys. I have a customer that wants to put it in his truck but not sure of exactly how it works. I have the transmission and I believe the cable. But there is some type of solenoid? on the rear of the tranny with some wires and a plug. What does this go to? Does anyone have what it goes to? Will the overdrive work without it? Any help will be appreciated.
Thanks, Bill