I'll venture its the rear main oil seal. You ought to replace that too while you're in there and going for the gusto, if only to fix a leak.

90 amigo 2.6 4wd calmini cam and header
Junkyard Rancho 5000's.... Lifetime warranty right?
Amigos don't run on gasoline,
They run on Love... <img src="/forums/images/graemlins/smile.gif" alt="" />