Diff Bushing upgrade
 

How many here have gone with urethane diff bushings? What were your experiences? Did you experience more vibration as a result? What performance benefits did you experience?

Looking at this set: https://www.z1motorsports.com/z1-pro...t-p-10356.html

Don’t.

I’ve done solid bushes with rose jointed suspension on an S13. The noise is horrendous. It handles well, but it is awful noise


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Which type did you run? The ones I linked are urethane, any experience with those?

Hard race


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Lots of people here have gone with the Z1 urethane diff bushings and reported no big increase in NVH.

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:shakes head: Go to your favorite web search and type in "urethane bushing site:the370z.com" (site:the370z.com limits the search to this site). Add -christ to omit hits on a sig that has urethane in it.

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.

Thanks! I don't track the vehicle, it is my daily at the moment and my driving is spirited whenever I have the opportunity. I most likely won't be doing the install myself. Should I expect vibration with the urethane bushings also? In what form would vibration manifest itself with them? Cabin noise? Vibration felt in the shifter or other controls?

I've had the Whiteline poly diff bushing installed for the last 80K miles. There's still some slop back there but no issues on the street. SPL solid bushings are sitting in the garage awaiting install for track mode.

White line was mine. I did the anti roll bars as well. Diff noise was terrible but fun also. Don’t go for rose joints


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If you can’t or don’t have the means of doing the rear differential bushing install yourself take your Z to a shop or Nissan dealership service department you trust to do the install for you. This is an ideal job for a transmission/driveline shop. Depends on if you are on stock suspension or not will also depend on what noises you will hear from your suspension as well. Also consider the streets/highways you are driving on as well. Most of all brand polyurethane differential bushings for our Z’s have the same characteristics and noise level as the Genuine Nissan OEM rubber bushings don’t be afraid to install them and polyurethane bushings are also more durable than rubber bushings in turn they will last a lot longer. Performance wise it will improve with the polyurethane differential bushings but you will still have some play in the rear. I have been running solid differential bushings on every Z I have had only really notested noise with the solid differential bushings the polyurethane differential bushings are overall quiet.

Do the install yourself. If you're not mechanically inclined that's okay. You'll gain lots of new tools and knowledge out of the experience.

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I actually am mechanically inclined. Have a bad back and neck, so I choose my battles these days lol :icon17:

You need an Acetylene torch to cut the old
Bushes out. If you like refinement don’t do the Diff bushes. If you like the whine of a Hewland race box do it, because it grinds and whines like a rally car . I regret going solid bushes for a daily driver


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I have the Z1 poly bushings and like them. No gear whine at all. My subframe however has solid NISMO bushings. I also have a modified Bellworks diff brace. I did get some noise from that.