Originally Posted by Eddieandgail
Surprised by suggestion to leave it alone. I had not seen any oil leaking under that motor for the 200 hours since I have owned it. About 2 tablespoons, at most, on bottom lip of bell housing when removed. I would be thrilled to not need to explore further so will check in with Brian on Tuesday.
If no oil has been dripping from the bellhousing, then even if that oil was from the rear main it's really not an issue. It could just as easily be oil that has collected there over the years from oil filter changes, leaking valve cover gasket, etc. Considering how big a job it is to change AND that there's no guarantee it would ever be totally leakproof, I'd leave it alone unless the amount dripping out became a problem.
When I pulled my trans to have it rebuilt I'm sure I found some oil in the bell housing but it hardly ever has even a single drip on the pad below, so I don't worry about it. I think most of the oil I found came from the previously very nicely leaking valve cover. (fixed with a new gasket)