what we always did was add 3 more countersunk screw drilling and tapping on the DB hubs, used the open bearing on both sides, make sure when pulled the axle, we got everyhting clean and dry, used permatex ultimate black RTV, no gasket but thew o-ring, let the silicone cure before rear dope was put back in the housing, always worked like champ. The problem with greasing the bearing, a seal bearing is out of the question becuse only one side is available in a sealed bearing, so you constantly going back inthere and greasing the bearing. I used to have switch diffs a good bit for tracks, so i'm guessing I've probably done this job a 100 times in my life, I've tried evertything. Also alot of folk tend to over fill thier housings, you should fill alevel housing until you can just get gear oil on your pinky, never let it fill enough to run back out the fill hole.