Leak coming from A833 bell housing. Help!

If you just replace the rubber seal that's in the bearing retainer, that's easy, except for you have to pull the trans. Depending on the large or small size bearing retainer, if you wanted to replace the input shaft bearing, easy enough for the large one, the small one, you have to pull the tailshaft out and remove the cluster shaft ( I believe) to pull the input shaft out. Big deal. Replace the seal.