Bizarre clunk in the rear suspension NEED HELP!! - Impala Tech
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post #1 of 5 (permalink) Old 03-23-2015, 11:53 AM Thread Starter
Join Date: Jan 2014
Location: ut
Posts: 13
Bizarre clunk in the rear suspension NEED HELP!!

Ok here goes I have a 1970 chevy impala 4 door and i have upgraded the rear with all the umi stuff I could get ....... Umi upper control arms, Umi boxed lower control arms, Umi adjustable panhard bar, Umi rear sway bar. All are tight and lubed properly I have the stock sized springs back there with new upper isolators, and new KYB shocks. But on the passenger side i can still feel a slight clunk and its VERY annoying any ideas Im completely lost.
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post #2 of 5 (permalink) Old 03-23-2015, 03:38 PM
Join Date: Jan 2006
Posts: 12,456
Could try and magnetically mount a movie camera (I-Phone, Android clone phone) under the axle hump to look at the suspension as you drive around a parking lot on Sunday morning. A magnetic base for a dial gauge and some Red Green duct tape should hold it in place while allowing different camera positions to watch what is going on.

Big Dave
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post #3 of 5 (permalink) Old 03-25-2015, 09:12 PM
Join Date: Aug 2008
Location: Miamisburg, Oh.
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you said you can "still" feel a slight clunk? you mean, in the many days since these new parts went on, or was it doing it before the upgrades?

does it clunk only over bumps? not in corners? did you try to replicate by having a couple of guys bouncing the back of the car?

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post #4 of 5 (permalink) Old 03-26-2015, 11:33 PM Thread Starter
Join Date: Jan 2014
Location: ut
Posts: 13
yes i had the clunk before the upgrades only on bumps corners n bouncing it doesnt do it. recently i changed my rims to a set of 15x7 rally rims. What i did find is i had 3 15x6 n 1 15x5 or a 15x4.5 i was alot more narrow than the other 3 n until they didnt have the tires on u couldnt tell. I did notice it didnt fit the center very well and so maybe this was the problem cus since doing the change same tires it seems i havent heard it yet and its been 3 days. So i dont know its a bit weird haha.
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post #5 of 5 (permalink) Old 04-07-2015, 06:28 PM Thread Starter
Join Date: Jan 2014
Location: ut
Posts: 13
well after much looking and searching I found that I had a bad body mount on the rear by the back door that one had no rubber left above or below and the bolt head was broken off. Then there was another back on passanger side by the fuel tank. that one had good upper rubber but the bolt head had broken off. So we were able to remove the bolt through the passanger side one and add a new bolt and new lower rubber mount and solved. The drivers one and the main noise maker was a bit harder but we were able to put a new rubber upper mount in and weld on a new reciever nut and then we put the new lower rubber and such on worked like a charm ........ amazing at the difference in the ride quality but more so in the enjoyment of driving my car it made. Just thought Id share for others in case someone found themselves looking for a mystery clunk
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