The Dana 44 I had in my Willys (and the Dana 25, for that matter) had a plug in the cover for filling and a plug in the casting for draining. The drain accepted a 1/2" socket wrench extension. It got easily covered over with muck, though, so it was easy to miss. If you don't have one of those, you may have to take the cover all the way off if the seal is good.
