If it is an Eaton 851 it was repairable back in '99. The problem si where to find their PN 103960 seal. Now the seal have the specs on i but to get to it you must remove the axle housing so you can remove the bearing in front of the seal. This not a job for a DIYer to attempt as there several other parts involved in the axle housing that must put in the correct order. I have ever took one these apart yet. The parts I see on the IPL may just stay in place as axle housing is removed, just don't know for sure.