This may sound like a dumb question but when yall say "grease the outdrive" yall just coat the outdrive in grease right? This doesnt affect the diff oil? Does it help with leaking to put grease on the ring gear where it meets the cup? Does it matter what "grit" sand paper I use for sanding the cup? I am gonna try all the tricks to help with diff leaking this next rebuild and want to make sure I do it right.