I decided to show you a modification I usually perform on Muncie M - 20 Main Cases. The Muncie M -20 Case only has an upper fill plug. There are no drain plugs in the lower hole. In all cases the lower hole is not even drilled. Why? I do not know. If it is a tranny I do I drill out the lower hole, tap it for the pipe threads and install a drain plug. Getting old oil out is a must in my book
