I recommend those seals to just about everyone that goes offroading with a D30. Mine have worked perfectly and even saved my bacon once. Somehow, I managed to break both front U-joints at the same time. The seals kept my axle shafts horizonal and in line with the stub shafts, so I was able to move the jeep. I didnt even know they were busted for a bit, until 4x4 made some neat sounds. The seals got alittle egged out, but they still hold grease and still keep water out.
J.