Oil leak is probably a tranny seal. Not that big of a deal, part is like $7-$10. Unless the bearing goes out, intermediate shafts don't go bad so there is no reason to replace it.
I'd have to hear the sound to tell you what to do.
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Don't bother giving me "rep", I won't return it and I think it is stupid.
Gracie Barra Clearwater
Gyms in Clearwater, St. Pete and Port Richey
pm me if you are interested in trying a free class at any of the gyms.