I've seen a couple of guys mention about the angles on the rear diffs to make the oil go to one side or the other. Seems to me, with the diff gears spinning and the oil nicely warmed up, the oil is going to splash out to the bearings eventually anyway. The inner seal is the real barrier to stopping the oil from reaching the drums.
The Cdn Forces old chev 5/4 ton rear wheel bearings were oil fed, although you would pack them with grease initially. I remember some of the guys would jack up each end of the axle after having the hubs off to try and prelube the bearings, but I also remember seeing one of those guys siezing up the rear bearings on a road test because they didn't pack some amount of grease into the bearings first.
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