Rear seal leaking isn't very common. Look for the highest place you see oil. It could be running down from a cam seal or valve cover. If you live where they throw piles of salt on the roads, don't overlook a pin hole rusted through the oil pan.
Pulling the transmission is easier, but at 140,000 miles, I'd try to ignore the leak until the transmission needs work, then the cost of the seal replacement will only be for the additional part and a few minutes extra labor.
Caradiodoc
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Saturday, January 23rd, 2010 AT 7:12 AM