In my Bronco, the 9" rear axle has the tapered roller bearings and has started leaking. With these bearings (Timken Set 20) is there supposed to be an inner axle seal? I have just been using the ones that came with the bearings that go on the outside of the bearing. Also, should the oil level be high enough that some runs down the tubes to the bearings?
Yes, that's what keep those bearings lubricated.