TH350 overdrive ID

I have a TH350 Trans in a hotrod which has an electric plug-in on the drivers side. As I understand; that would make it a 1984 or newer unit. I presently do not have anything plugged into it altho I do have a pigtail to plug into it. Does having the plug-in make it an overdrive unit? If it is an overdrive unit; how would I wire it to utilize the OD?

It's a locking converter 350, not OD. That plug is for lockup.

oh, yes,,,locking converter. Again then, what would it take to get the locking converter to lock up?

Just hook up 12v to it, with a switch on the dash or somewhere convenient so you can lock/unlock it at will.