8 3/4 leaking diff fluid into Brakes

Thanks for all the suggestions - I will definitely be following up on some of these. I believe that Big Block Mopar is correct - that seal in the housing is supposed to control the diff fluid from getting out and into the bearing and brakes, the rest keep crap out of the bearing from the outside, not the housing tube. This hasn't always leaked but it has leaked after two housing seals have been replaced. I haven't tried the vent, but it makes sense and I will definitely get a new one and replace it. I can see how a poorly adjusted bearing would allow the axle to be pushed up into the seal creating a gap at the bottom. I wish there was a better way to figure out how loose is too loose beyond the dial indicator called for in the FSM.

Mycuda any recollection as to where the heavier, tighter seal came from????