The only way is to wait for engine to cool, unscrew the bolt where you would poor new oil in on the tranny and stick your finger and feel the level, or just add oil a little until it starts to overflow. I know it sounds ghetto but that's exactly what Haynes manual says and the only way to do it.
hey by the way its not Tranny oil its called gear oil, Dont put ATF in there you will mess up the tranny
