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JXB mount. That level of destruction may not be impossible on its own, but I think it would be obvious your CSB was bad before it got bad enough to do that to itself. The JXB comes with its own rubber to use, and the rigidity is much closer a "solid" mounted bearing without any rubber, if that makes sense. I thought that extra rigidity would solve this vibration, but it just made it much more severe at higher speeds, as mentioned in the original post. You're still dependent on aftermarket CSBs being available in the future and using just the bearing out of them to make the JXB work. I have and love the BDE trans mount (along with BDE engine mounts), but I never felt the vibration through the gearshift, even with the Zspec solid mount shifter bracket installed. While the poly bushings could absolutely play a part in amplifying these vibrations, seems some people experienced the vibrations on stock equipment as far back as the late 90s when the z32s were still relatively new and fresh.
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