I am working on installing the trans in my 1989 Trans Am GTA today, but there are three connections to the transmission. I have a 700r4 going back in, and it only has two plugs on it. My book says the connections in the wiring are : Lockup, 4th gear, and coverter. One is big with 4 plugs, one is very small and oblong with two wires, and the other has two long plugs. The trans is from a 1992 4x2 truck, but it matches exactly with the 89 truck trans I have. I know where the big 4 wire plug goes and have found where the long two plug goes(looks like it goes where the speedo should be). What is the 3rd one for? I see that supposedly one could get the 200-4r trans as an option, could this be a connection for that?