Clunking Noise 350z
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I recently installed some godspeed lowering springs in the rear. I had previously done the same with some cheap eBay ones awhile back but there was a loud clunk going over even the smallest of bumps. I thought it was the cheap nature of the springs so I bought some higher quality springs. After installing the new ones the same problem occurred. I tried the springs with both OEM shocks and aftermarket ones and the problem seizes to go away. I tried trimming the bump stop as well. The clunking goes away after raising the car back onto OEM springs. All the Bolts are tightened to spec aswell. I raised the tires with a jack to see if it was a clearance issue but everything cleared and the shocks never bottomed out. Any Ideas
Last edited by x3vs; 05-19-2022 at 05:41 PM. Reason: Title
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Did you replace the gasket that is between the shock mount and the body? That can be a source of noise. Another item I found in my searching when try to excise my Z of all suspension noise was that the lower shock bolt/mount in the rear "could" allow for movement and noise. Some people have added a bushing to the shock mount hole that the threaded side of the bolt passes through in order to eliminate/reduce the possibility of play there. There's a lot to search and learn here in the forums on suspension noises that might help, too.
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Sounds like upper shock mounts. You can't see the failure but the bushings in the mounts wear and tear over time. Especially pronounced with stiff springs. BTDT at least 3-4x.
https://www.z1motorsports.com/rear-s...oaAlRwEALw_wcB
Or other sources for cheaper than OE.
https://www.z1motorsports.com/rear-s...oaAlRwEALw_wcB
Or other sources for cheaper than OE.
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khnitz (05-20-2022)
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