A-999 Swap and Information

Hi there,

Got a A999 transmission out of a 1989 B250 van. It's a lock-up unit and was tied to a 318. I've read about the advantages on this unit but im not really sure how good or bad it is the fact that its a lock-up transmission. Besides that, there are 4 wires attached to the trans (3 for neutral switch and one which I have no clue). I'm going to swap it in my Duster and haven´t been lucky finding information about the blue wire I have no clue for what it is used for. Any pro/con's on the fact its a lock-up or any idea what should I do with the blue wire w/ white line? Any help appreciatted.

Thanks, Jose