1988 4x4 ranger auto trans

[tandksranger]

I have a 1988 4x4 ranger 2.9 automatic, got the truck cheap no trans in the truck. I got a used trans out of a 88 b2,the problem is the TCC plug-in on the new trans is a three pin the one on the truck is a two pin. I have a wire harness with the three pin on it. do I nee t change the ecm too?