It's on an older Craftsman rider a friend gave me. What I suspect went wrong with it is the left wheel bearing gave out, slung the pulverized remains into the spider gear assembly and something came loose. I haven't removed it yet, but will probably this weekend. Just wondering if any of you have taken the trouble to replace or repair the wheel bearing, spider gear assemby? It is a split case, so if lucky it's only the left side to repair. The easy fix it to replace the whole unit and repair/rebuild the 600 tranny this winter. Think it would make a good boat anchor once the grease is drained out? Any thoughts?