My last original tranny cooler connector is seeping, my engine oil filter mount is seeping, my valve cover is seeping, my front crank seal is seeping, the front seal on my transfer is throwing a little fluid and my son missed the hole trying to top off my motor oil the other day. Doesn´t really drip though? Maybe because I wash it off, often. Come spring, I´m gonna have to plug up some leaks, in the meantime (unless it gets bad) I´ll just consider it an anti-corrrosion treatment. If it starts dripping on the exhaust, I´ll probably fix it quicker, I hate that smell.
If the rear seal is leaking, it usually comes out at the dust shield, at the bottom of the bell housing. It sometimes builds up in bell housing and looks like more than it is. Make sure the drain hole at the bottom of the dust shield is not plugged. Keep track of how much oil your looseing. I had a fairly serious leak, at the rear main, that required about half a quart of oil every thousand miles (left spots in the street), on one XJ.
I´m still looking for a double ridge replacement seal, that might last. Most of the rear seals I´ve replaced (Fel-Pro), started seeping again, in a year or so. Seems to me, a double or triple ridge seal, might last longer. Or a double ridge seal with a felt insert. Sure I´m not the first to think of this, somebody has to be making one.