OK this is not so much a solution as it was a mistake. Both my nephews have been running their slash's with center diffs for about five months. Four months of a indoor carpet season and about a month outside now. After I melted my center diff case when my bearing locked up one pack after I just check it I said they better be checking theirs more closely. One stated yeah why does my spur gear rock back and forth like this. When I looked at it I thought he had tore some stuff up like me but it turns out that when he installed his center diff he never read the directions and never took the bearing off the slipper. He and his brother have been running for five months with NO bearing and with NO problems. Of course they put the bearing on but now I'm starting to wonder if maybe they were on to something. While this solution is not perfect it may be the lesser of two evils. Has anyone else got four months on a bearing with no issues?