This is a dumb question, but I don't have too much mechanical experience. I took my rear drive shaft off to change a u-joint and some atf fluid leaked out of the tranfer case. It was a half a quart to a quart. Now I don't know how to fill it back up. Where is the fill hole on my tranfer case. I didn't see anything recognizable. Maybe I can't see it for all the old crud caked up on it. Thanks for the help.