my friend is trading his truck today for an 88 camaro with and rebuilt tranny with a shift kit, and a 71 corvette motor in it, the guy says it need the line from the tranny to the rear end hooked up, i dont understand what it does, he says when you hit the brakes the tranny will sense it and drain the tranny fluid into the pan, and he said something about draining the torque converter, also the brake lights wont work without it.