There should also be a sight plug on the side or rear of the transmission for use as an indication of lube level.
Yep, Filling the tranny till oil starts coming out the fill plug hole on the side is the way to do that. You can't "sight" in there very easily, but if you stick your pinkie finger in the hole and can touch the lube, then there's enough in it. If your pinkie finger is too big to fit in the hole, get your wife or girlfriend to do it for you.
