It should be an easy thing to follow Jerry's (Hotrod Lincoln) advice from your other thread? "Back the nut all the way off, and see if the seal between the nut and the pivot ball is damaged or missing. Those are still available, and I believe some of them have a diagonal cut that allows the gasket to be installed without dismantling the entire torque tube/universal joint assembly.
Jerry" The nut he references is on the end of the transmission tailshaft.
If it were my truck, I'd do my best to find the split seal Jerry referenced. Someone may jump in with a source. With said seal in hand I'd place a container under the transmission tailshaft, back the nut referenced above off and replace the seal just because it might work. I've never attempted this but how hard can it be. Famous last words at my place.
