Since you are in Indiana how close are you to Moser's? Maybe take it over there

Is your bearing bad?????did it fit tight into the housing?
Are the axle seals good? Who narrowed the housing? Did they use alignment jigs???


there are lots of things that could cause it to leak, so be a little more specific about the housing and any and all modifications

Where the ends new? or cut offs from a stock rear end?