its your right (clutch side) crank seal,. there not that hard to replace as long as you have some sorta clue on what your doing. just take the clutch out, pressure plate, steels and friction plates, inner hub, basket, then take the crank gear off and youll see the seal, just pry it out with a screw driver without damaging the cases, or you can drill a drywall screw in to it on each side and tighten them slowly with a screw driver and itll back out. this should take 1-2hr make sure you use oem seals always.