Transmisson Fluid Level

Hello All;
I have some questions in regards to checking the transmisson fluid level .

1. I know the engine has to be running..Should the transmisson be in..park or neutral?

2. Should the fluid..drip or flow from the hole when I open the "fill " plug ?

3. Does the engine have to be running to fill to the proper level ?

4. Can I put to much fluid in ?

Thanks In Advance........................Fred

Park is fine.

Drip.

Yes.

No, the excess will run out. If you use a clear tube to fill it you can watch the excess drain out. When it stops , remove tube and cap the pan.

Related question... how does one service the differentials?