OK - so last fall I switched from the old bendix style shafts to U-joints, after breaking one of the old ones. I got some used axle seals with retainers with the U-joint style shafts. After a few months these things started leaking like crazy. So - I replaced them a couple of weeks ago with National seals part# 450073. Guess what?? They STILL leak!! Changing these things is not a quick or easy job for me to do. Wrestling 44's on hummer wheels is not my idea of a relaxing Sunday. With all the clean-ups we've been doing, and have scheduled, it would be stupid to go wheel and leak gear oil all over the place. Does anyone have any suggestions? Any experience with this kind of problem? And before you ask - YES, I greased the seals before sliding the axles in. And yes, the seal surface of each shaft looks perfect, no scratches or gauls.