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Originally Posted by chalmene
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Indeed if you search you will find a lot of info on this topic. Depends on what your tolerance to noise is? What do you use your Z for? If your Z is mainly for street duty I recommend the urethane differential bushings as excessive noise from solid differential bushings used for street duty can be annoying to some. If you track your Z at all definitely solid differential bushings would be the choice. I recommend the Whiteline urethane differential bushings I found them to be quite durable in my experience. If you install differential bushings don’t forget to get the rear differential bushing removal tool you will need it. Also this is a great time to change your differential fluid.