I have always had excessive slack in the cush drive. Some have cured this by going to the tbs cush drive. Me being cheap and after inspecting mine and not seeing anything wrong with it tryed this. I happened to have some old rubber strapping that I cut and made shims out of. The belt was about 1/4 inch thick. I think I made about 5 shims. Thigtened things up nicely. Been running this for a few thousand miles now and seems to be working well.
