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rear swinging

Discussion in 'Chassis / Drivetrain / Suspension / Wheels' started by mickeypowa, Mar 19, 2017.

  1. mickeypowa

    mickeypowa Apprentice

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    Hi guys !!

    I have a little problem with my gbody. When I drive at low speed (under 20mph), I can feel the rear of the car swinging left-right.
    When I drive on a pothole (there are a lot here !), the rear swings left-right too and It doesn't feel really safe..

    I was thinking that it could be the shock absorbers ? I have a pair of brand new rear air shock absorber, maybe I should try them.

    What could it be ?

    thanks !
     
  2. lilbowtie

    lilbowtie Royal Smart Person

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    First thing I would do is check all the swing arm bushings.
     
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  3. Anubis

    Anubis Royal Smart Person

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    Sometimes cheap radial tires with broken bands will cause it. It's only noticeable at low speeds.
     
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  4. lilbowtie

    lilbowtie Royal Smart Person

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    It would be nice to experience some of these described problems and we would probably put our finger on them.
     
  5. ck80

    ck80 Greasemonkey

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    In addition to the above, especially checking all your bushings, what are you running for wheels and tires?

    A very narrow rim with a very wide tire, or a very underinflated tire with the sidewall bulging outwards might give somewhat of a sensation like that.

    Might be helpful to have someone drive off your rear quarter such as the lane next to you on a 4 lane road and describe what they see while you're feeling the sensation.

    Another worst case, but highly unlikely scenario, (also not knowing where you live) I recall in a rust belt state (back when rust issues weren't an inspection criteria) seeing a case where a car was very rusty at the body mount areas... the actual passenger cabin was moving around on the frame, and eventually completely shifted after going around an aggressive corner...

    Now, having said all that plus the above, does the location and road surface youre driving on have an effect? Is your low speed driving on rough or unpaved dirt/gravel when you notice it, and higher speed driving on smooth paved when you dont? If you haven't had and/or are a newer owner that's more unfamiliar with these cars, there is a condition called wheelhop that you wouldn't really get driving some Fwd newer car, assuming that is where most of your familiarity is... road surface, particularly potholes, make the rear jump a bit and the rear of the car feels like it's swaying as it relocates
     
  6. 78chevolds

    78chevolds Apprentice

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    I am experiencing the same issue and I suspect in my case its the rear control arm bushings are shot. I also get a clunk, not a U joint clunk, from the rear axle when I turn a corner and there is a slight incline.
     
  7. Bar50

    Bar50 Royal Smart Person

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    Also check the front sway bar and end links.
     
  8. TURNA

    TURNA Royal Smart Person

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    Are your lug nuts loose?
     
  9. mickeypowa

    mickeypowa Apprentice

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    What do you mean by swing arm bushings ? You mean the bushings of the upper and lower control arm ?
    Like on this photo : my upper control arm (I guess)
    [​IMG]

    When I bought my car, I had some parts given and I have some bushings from energy suspensions. But I have only 6, how many do I need for upper and lower control arm ?
    [​IMG]

    I have also air shock absorbers like that that maybe I should put on :
    [​IMG]

    I have mickey thompson sportsman tires, well inflated, with 16" rims, they seem to be in good shape.

    https://www.summitracing.com/int/search/product-line/mickey-thompson-sportsman-s-r-tires

    Here is a video of the tires rolling, they seem to be OK, no ?



    I don't have rust on my car. (almost!)
    The problem of swinging happens on a flat road, even with not potholes.

    What do you mean ? The front stabiliser bar, ball joints and tie rod ends ?

    I checked all lug nuts are tight.
     
  10. TURNA

    TURNA Royal Smart Person

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    The lugs are tight but are the correctly seated all the way down.

    You say you have the issue at low speeds. Most issues listed above should be worse at high speeds
     
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