I don't think you want to do what you're doing. There is a seal that goes in the back of the transmission that seals the area between it and the transfer case. Eventually you may have ATF pouring out the back of the transfer case. That slot you're filling was put there to warn of a leaking transmission seal. I believe the Dodge part # is 83503108 and NAPA number 19601. Seems like Dodge charges around $45 and all the other guys are a fraction of that. Also, your rear bearing there looks kind of dirty. That may just be the photo.