Knocking Sounds From the Rear. Please Help! - Chevy Impala SS Forum
 
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post #1 of 6 (permalink) Old 04-18-2002, 07:37 PM
Mags94SS
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Hello Impala Brothers,

My car has a knocking sound that is coming from the rear of my car. I thought it might of been the right side exhaust pipe that was hitting the spring or something everytime I hit a bump. I have some new springs and shocks that I put on some 10,000 miles. Today I went under the car and had my brother push on the car to simulate the rear end of the car hitting a bump. I didn't find any objects that were hitting against anything else. Could it be the control arms or could one of my shock(Bilstien) be defective? What do you guys think might be causing the problem?

Thanks,
Mags94SS
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post #2 of 6 (permalink) Old 04-23-2002, 01:52 PM
StuB
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My brother just had his 94 9c1 in for service today and he asked the tech to check the rear end because it was making a clunking noise sometimes when he accelerated or went over a bump. It turns out that one of his upper rear control arms is broken. I am in the process of convincing my brother to replace all of his rear control arms with either Metco (which I have on my 95 9c1) or Hotchkis control arms. Anyone know which would be better? Mine were on when i bought the car, so I have no idea.


Stu
post #3 of 6 (permalink) Old 04-24-2002, 08:40 PM
Mags94SS
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Thanks Stu, I'll go under the car sometime tomorrow and investigate some more. Others on another trend suggested checking the rear sway bar and heat shields, but those were fine. Here is a link that might help answer why most Impala owners like Metco control arms, hope it helps and works. Thanks, again for the idea of checking my control arms.
http://www.b-body.net/Technical/Susp...rms/METCO.html

Mags94SS
 
post #4 of 6 (permalink) Old 04-25-2002, 11:18 PM
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My old 1994 9c1 had a simular problem when investigated it was a cronic problem the axel bearing ate in the axel shaft a bit, cured by some speacial larger bearing by GM. Mine popped over bumps too. Hey if it is a 9c1 and it is the trailer arms it may be under a recall as mine were and fixed for free. I am trying to find a wheel center kit for the rear of mine now...
post #5 of 6 (permalink) Old 04-25-2002, 11:32 PM
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I forgot to add this little peice of info.

Today my new 1994 9c1 had the rear arms replaced due to a recall notice. Okay the story goes is the spot were the sway bar blots up to the arms is likely to tear during severe duty use so they recalled all cop cars for a fix. Thats all cool and nice but your Impala SS owners all have the original rear set up as the 9c1's. They did not recall your cars becuase "they are not severe duty" Now we all know alot of the Impala owners have just as much fun at high speeds and corners and such as any 9c1 owner but you are not being fixed. If it does tear as the safety recall stated " It may seperate the rear end from the car and cuase the driver to loose control." Like no DUH! Anyway food for thought...
post #6 of 6 (permalink) Old 04-26-2002, 11:04 AM
AutocroSSer
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See my reply in the other thread on this. In summary, the "new" GM arms are only marginally better than the old ones.

There are aftermarket arms available that "extend" the arms 1/2" or 3/4" to center the wheels up.
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