904 Leaking small amount of fluid after rebuild.

I wouldn't be afraid of overfilling it if you aren't going to even put it in gear. I started one up once and added all the fluid because I knew exactly how much it would take. I forgot to start it in neutral tho, so fluid started running out the vent in the bell housing. When I saw it dripping, I pulled the stick and it was about six inches above the full mark. I jumped in the car and put it in neutral, jumped back out and checked it and it said LOW. I added half a quart and drove it immediately and it was fine.