jgrracing

So I have been rebuilding my 4l60e and ran into a problem/question. Is there any way to set or even tell if the force motor is operating at stock pressure? It had a shift kit in it before I got the car and I dont know if the line pressure has been bumped up or not. I have heard many say that there is no way to tell what it is set at but I just want to confirm this. Just trying to save a little time by not having to drain all the fluid and tinkering with it since I am working under the car without a lift.

Thanks, Colby.