Got a 9" from a 79 bronco under the CJ. Went with the 9" disk conversion with chev rotors, calipers etc. Everything works tip top. I've installed the 51098 national seal at the wheel mounting end. It has the tapered bearings. Came fully greased from the Zone. I still get leaks when I'm wheeling. Has anyone ever used the seals like these?

http://www.stockcarproducts.com/rear8.htm

I called them and he said my tubes are way too big. They are mainly used for stock car stuff but would like to find a source for my application? I think I'm 3 1/2" ID on the tube at the 3rd member end.

If it's leaking past 2 seals, you've got another problem. First, make sure the axle vent isn't blocked. Then, I'd suspect a bent housing, which can usually be fixed.