Strange Suspension Issue - Chevy Impala SS Forum
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post #1 of 5 (permalink) Old 05-20-2016, 04:01 PM Thread Starter
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Strange Suspension Issue

Bought a SS last week. Having a strange problem. Drive down the road at highway speed, when I slightly accelerate or decelerate the rear of the car shifts to the left or right. It almost feels like I hit a groove in the road.

I jacked up the car today and checked the rear control arms and they look ok, as in there is nothing that looks broken and all the bolts are in. I also check the trans mount and that seems ok.

Could it be the bushings in the rear control arms have play in them?

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post #2 of 5 (permalink) Old 05-20-2016, 06:16 PM
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The control arm bushing may look OK, but can be rotted to the point of allowing slop. The only way you can check is to pull the arms. If you are going to do the lowers, do the uppers as well. If the rear is shifting around, it will put strain on all of the bushings, causing accelerated wear. Now might be the time for the extended arms, and a Ford CV driveshaft.

The trans mount would not cause the car to react the way you describe. you would probably hear a clunk, but that would probably be the only symptom. To check it, put a jack under the trans and try lifting it. If it lifts, the mount is probably broken. They have a tendency for the rubber to shear between the crossmember and the trans.

1991 OCC 461 (.030 over 454) BBC, 3.23 posi, flash to pass, drop spindles & springs, Impala rims, Hydroboost, Recaros, MOMO/wood SW w/QR, custom wood shift knob, Pioneer DEH P77DH
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post #3 of 5 (permalink) Old 05-21-2016, 11:47 AM Thread Starter
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Yeah, it has to be the bushings. Trans mount seems fine. Ordered extended arms today.
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post #4 of 5 (permalink) Old 05-21-2016, 03:06 PM
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Extra Reading

Another source of slop may be the hole on the lower trailing arm see TSB 53-34-03. I think I found it by searching for: "TSB arm"

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post #5 of 5 (permalink) Old 05-21-2016, 04:38 PM
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You can get this symptom from uneven tire pressures as well, more pronounced when there is a locker or spool in a differential. Make sure the tires are the same size on the rear as this will do it also.

1996 DGGM Impala SS
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