C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

What goes Clunk Clunk???

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Old Aug 12, 2015 | 12:05 AM
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Default What goes Clunk Clunk???

LOL I need a list of what can clunk/thud around the rear suspension, stocking bushings all but poly shocks.

I got on it once and it hooked up decent and I am 100% positive I had a loud clunk thud from behind me. Now I got on it several times after and nada, but I don't think it hooked up that good after the clunks.

I have new spicers u-joints all 6, one new wheel bearing & c-beam plates. There is no noise or vibration.

1st thing I'll check is the bump stops. I'm gonna crawl under it tomorrow cause I gotta check when I bottomed out later and make sure it wasn't either pan. MI roads exhaust always scrapes and mine is as high as it can go under the rearend. Should of never took that road, it already turned my round tube into a D shape on my C3. Sill the C3 exhaust is lower.
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Old Aug 12, 2015 | 02:15 AM
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Almost sounded like something hit the back floor.
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Old Aug 12, 2015 | 08:27 AM
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Might just be your exaust banging and flattend is not helping your power
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Old Aug 12, 2015 | 01:09 PM
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Rear differentials can clunk when they are going bad.
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Old Aug 12, 2015 | 01:13 PM
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Originally Posted by l98tpi
Rear differentials can clunk when they are going bad.
Two loud thud clunks?


It sounded like something moved or I ran something over and I know not the 2nd it was a brand new, clean, clear road.


edit: Last night while in bed I thought maybe it was the compartment lids? After the noise I stopped at the car wash, the hood wouldn't pop. I had to use the e-releases, then later at home it popped just fine.

Also I'll add engine mounts to my check list, it's forward but still worth checking.

Last edited by BOOT77; Aug 12, 2015 at 01:16 PM.
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Old Aug 12, 2015 | 02:18 PM
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I'm good at the guessing game. What goes "clunk clhnk"?....hrm

I got it! A clunker!

Tranny mount allowing movement? My friends firebird did that.
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Old Aug 12, 2015 | 02:20 PM
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No trans mount on a c4 and I have c-beam plates.

I know people replace the bat-wing bushing with poly, but do they clunk?
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Old Aug 12, 2015 | 03:15 PM
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When I had a clunking noise in rear, it was because the sway bar end links were toast.
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Old Aug 12, 2015 | 05:19 PM
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Originally Posted by AGENT 86
When I had a clunking noise in rear, it was because the sway bar end links were toast.
I removed it earlier that day, links too.
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Old Aug 12, 2015 | 06:52 PM
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Originally Posted by BOOT77
No trans mount on a c4 and I have c-beam plates.

I know people replace the bat-wing bushing with poly, but do they clunk?
Torue arm??
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Old Aug 12, 2015 | 11:19 PM
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Well couldn't find anything or see any witness marks of anything and it hasn't done it again.
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Old Aug 13, 2015 | 01:17 AM
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I managed to get my rear sway bar on upside down and it hit the frame -- clunk.
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Old Aug 13, 2015 | 08:31 AM
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I agree with rear sway bar link bushings that's what was making noise on mine. Very loud clunk rear over bumps. It's a wierd design but they are very cheap. Need to be pressed into the sway bar link.
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Old Aug 13, 2015 | 08:58 AM
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Did you run over Rosie O'Donnell? No wait, you didn't total the car. Never mind.
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Old Aug 13, 2015 | 02:36 PM
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Originally Posted by BOOT77
I removed it earlier that day, links too.
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