I didn't have to take the tailshaft housing off. All I had to do was remove the crossmember, remove the entire exhaust system and drop the tailshaft down far enough to get at the seal.

Three and a half hours later, it's buttoned back up. My only worry now is that it's something other than the seal. The yoke snout looked fine, and so did the bushing. I do not want to pull this transmission. I'm not sure I can get it out without taking out the radiator shell, radiator, hood, exhaust, etc., etc. . . .

Maybe I've got an F-14. A Tomcat pilot told me "If it ain't leaking, it's empty."