Since no one has answered yet I will keep it going until someone does. I don't know the answer except to say that understanding the 700R4 is not as widespread as information on the TH350/400. As far as I know the stock 700R4 required an electrical signal to lock/unlock, but why your trans does not have wires may be a model I do not know about OR an aftermarket replacement unit. If no one else answers try calling:

www.eatmyshift.com

phone 352-683-8384

Monster Motorsports
13743 Linden Dr.
Spring Hill, FL. 34609

I bought a mildly modified 700R4 from them for my '29 roadster BECAUSE they modify the electrical switch and use an internal pressure switch instead to lock the 4th gear, that way I do not have to have any wires. However, I do not know why your unit does not have wires. For the price of a long distance call (if no one else here answers) the Tech guy at Monster Motorsports should be able to answer your question.

Don Shillady
Retired Scientist/teen rodder