I just got my Z back after having it stored for several years. I now notice a thump in the rear end under moderate acceleration. I know the first thing that comes to mind is the insulation, and believe me I have not discounted it as the culprit. However: it seems to be fine, the u-joints in the drive shaft and axles dont have any slack either. Mustache bar bushings seem to have slight wear. My problem is that I think the slack is in the rear end diff. itself. I have never had one go bad, but it seems to have quite a bit a slack. :sick: Does anyone know how much is normal? Also does anyone know of any website that lists the gear ratio's and what year models had what rear end in them? Trav