Suspension & Brakes Theory, alignment, spring rates....

knocking from rear suspension??

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Old Feb 6, 2008 | 12:24 PM
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Default knocking from rear suspension??

when i originally put on my skunk2 lowering springs w/ the stock shocks from my 98 EJ6, it made a loud clunking/ knocking sound from my rear suspension only. i figured it was just because the spring weren't seating in the upper mount right because of the stock shocks. so i then bought some skunk2 sport shocks to go with my skunk2 springs, thinking that it would solve the problem.

Unfortunately it did not help, i still have the clunking/knocking coming from my rear suspension. so what else could it be?
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Old Feb 6, 2008 | 04:37 PM
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Default Re: knocking from rear suspension?? (jewpont)

Do you have a rear sway bar?

Do you have an aftermarket exhaust?

Are all the bushings in the rear suspension tight with no play? Are the rear trailing arm bushings rotten?
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Old Feb 6, 2008 | 06:44 PM
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Default Re: knocking from rear suspension?? (Targa250R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R &raquo;</TD></TR><TR><TD CLASS="quote">Do you have a rear sway bar?

Do you have an aftermarket exhaust?

Are all the bushings in the rear suspension tight with no play? Are the rear trailing arm bushings rotten?</TD></TR></TABLE>no rear sway bar, no exhaust, there seems to be no play but i need bushings, my trailing arm bushing are torn. the sound seems to be coming from up top though and only on quick short bumps not big bumps.hope that helps narrow it down
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Old Feb 6, 2008 | 06:48 PM
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Default Re: knocking from rear suspension?? (jewpont)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jewpont &raquo;</TD></TR><TR><TD CLASS="quote">no rear sway bar, no exhaust, there seems to be no play but i need bushings, my trailing arm bushing are torn. the sound seems to be coming from up top though and only on quick short bumps not big bumps.hope that helps narrow it down</TD></TR></TABLE>
Make sure that you assembled the upper mounts correctly with all necessary hardware, and that the bushings are not deformed.
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Old Feb 7, 2008 | 06:05 AM
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Default Re: knocking from rear suspension?? (jewpont)

I also have skunk 2 coilovers but with kyb agx. My rear also makes noise when goin over small short bumps. I have looked at every bushing and recently replaced the trailing arm bushings. It still makes noise the only thing i can figure out is that the spring and the lower lock collar is causing noise. When i raise the vechile up with a jack the spring is not in contact with the lower lock rings.
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Old Feb 7, 2008 | 07:51 AM
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Default Re: knocking from rear suspension?? (phan222001)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by phan222001 &raquo;</TD></TR><TR><TD CLASS="quote">I also have skunk 2 coilovers but with kyb agx. My rear also makes noise when goin over small short bumps. I have looked at every bushing and recently replaced the trailing arm bushings. It still makes noise the only thing i can figure out is that the spring and the lower lock collar is causing noise. When i raise the vechile up with a jack the spring is not in contact with the lower lock rings.</TD></TR></TABLE>on mine it contacts completely and there is no play. its not really a big deal but since my car is gutted it gets kind of annoying and just want to make sure that the sound isnt from somthing breaking.
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Old Feb 7, 2008 | 08:17 AM
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Default Re: knocking from rear suspension?? (jewpont)

Do you have spring isolators (small flat ring of rubber or polyurethane) sandwiched between the spring and the upper mount?
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Old Feb 7, 2008 | 09:37 AM
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Default Re: knocking from rear suspension?? (Targa250R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R &raquo;</TD></TR><TR><TD CLASS="quote">Do you have spring isolators (small flat ring of rubber or polyurethane) sandwiched between the spring and the upper mount?</TD></TR></TABLE>do you mean the stock rubber at the top on the mount of after market spring isolators?
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Old Feb 7, 2008 | 11:07 AM
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Default Re: knocking from rear suspension?? (jewpont)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jewpont &raquo;</TD></TR><TR><TD CLASS="quote">do you mean the stock rubber at the top on the mount of after market spring isolators?</TD></TR></TABLE>
Either one. Are the stock rubber donuts still up there?
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Old Feb 7, 2008 | 11:54 AM
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Default Re: knocking from rear suspension?? (Targa250R)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Targa250R &raquo;</TD></TR><TR><TD CLASS="quote">
Either one. Are the stock rubber donuts still up there?</TD></TR></TABLE>uhh exactly what are rubber donuts? do you mean upper mount bushings?
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Old Feb 8, 2008 | 01:14 AM
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Default Re: knocking from rear suspension?? (Targa250R)

I had the same noise you are describing....wound up being rear trailing arm bushings. I though it was a blown shock originally but after pulling it apart to have a look I found the problem with the bushings. All quiet now....
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Old Feb 8, 2008 | 07:08 AM
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Default

i think im just going to buy the full energy suspension kit and do all that stuff. thanks guys.
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