got a 75% built kit car at work and it has the 2ltr pinto with auto box built in got it running finally but it wont change gear can get Drive and Reverse but when in drive it wont change up

question is what changes the gears ?

there is a breather type pipe that runs from the box to the front of the engine over the rocker cover and is just hanging there cant find where to plug it in

will try get a picture up but any help will be smashing