Is the 4th gear on an AOD tranny electronic? Aside from the normal shifting lever on the side of the tranny, there is a 4 prong elect connection. Is there some type of relay, or something that I need. The donor vehicle for the tranny is a 1983 ford E-150 van. Should I grab that part of the wiring harness?

The trans is behind a '72 351C in a 56 ford customline. I will be using a painless or equiv. wiring harness. Thanks.