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rear shocks bottoming out on hard reverse?

This is a discussion on rear shocks bottoming out on hard reverse? within the General Help forums, part of the LSx Technical Help Section category; Hi guys. I'm just trying to make sure this is a normal thing. My car is not lowered and i ...

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    Senior Member JayTA98's Avatar
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    rear shocks bottoming out on hard reverse?

    Hi guys. I'm just trying to make sure this is a normal thing. My car is not lowered and i put new springs like 1 yr ago. I 1st noticed of this happening when I had my car lowered and if I hit the gas hard on reverse the car starts this hard banging noise in the rear. The car moves but is almost like it is jumping. I'm thinking is wheel hoping.

    Now i Had to quickly backout of a situation when I saw a minivan backing up towards me and they didn't stop when I hit the horn. Again the loud banging noise and jumping came back. I recreated the the situation and every single time is the same result.

    So is this a normal thing because the car has so much torque? are my shocks going downhill? I have UMI SFC, TQ arm, panhard bar, LCA's and LCA relocation brackets. If i nicely hit the gas on reverse it does happen. Is only when I floor it. Thanks.

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    None Shall Pass Knight's Avatar
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    Sounds more like an issue with the torque arm.

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    None Shall Pass Knight's Avatar
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    I would think worn shocks would also show while driving as well.

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    Spaz is My Mentor SMWS6TA's Avatar
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    I think it is most likely wheel hop.

    Here's my reasons why - when you do like you did the rear suspension will want to raise up like the the front does when you go forward. Now the difference between the 2 is the front has about 700 lbs of weight in its favor. The rear does not, so as the tires bite they want to hop because the weight is transferring to the front of the vehicle and making the rear "lighter".

    Now it doesn't mean your springs/shocks are not going out.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    I think it is most likely wheel hop.

    Here's my reasons why - when you do like you did the rear suspension will want to raise up like the the front does when you go forward. Now the difference between the 2 is the front has about 700 lbs of weight in its favor. The rear does not, so as the tires bite they want to hop because the weight is transferring to the front of the vehicle and making the rear "lighter".

    Now it doesn't mean your springs/shocks are not going out.
    yeah thats what i kinda of think. is like the car is wheelie in the rear tires.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Knight View Post
    Sounds more like an issue with the torque arm.
    what makes you think is the TQ arm Knight?

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    Spaz is My Mentor SMWS6TA's Avatar
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    i see where he would think that too. The TA prevents the axle from rotating on itself. If the pinion angle is not correct it would cause binding. But you would feel that through the drive train.

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    None Shall Pass Knight's Avatar
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    Quote Originally Posted by JayTA98 View Post
    what makes you think is the TQ arm Knight?
    It's quite possible it is simply wheel hop. It was just a thought that maybe the torque arm wasn't properly holding the rear diff. It couldn't hurt to check over the suspension, if you get a chance, just to rule out anything being loose/broken. Hopefully it is just a wheel hop issue

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    O U 8 1 2 Spaz's Avatar
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    it's wheel hop... check the bump stops that rest on the axle tubes... they are probably dry rotted... i replaceed mine and the problem was gone...

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Spaz View Post
    it's wheel hop... check the bump stops that rest on the axle tubes... they are probably dry rotted... i replaceed mine and the problem was gone...
    nope, i replaced those a long time ago with polys

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Knight View Post
    It's quite possible it is simply wheel hop. It was just a thought that maybe the torque arm wasn't properly holding the rear diff. It couldn't hurt to check over the suspension, if you get a chance, just to rule out anything being loose/broken. Hopefully it is just a wheel hop issue
    yeah i guess i can get under and double check. i might get a video from the side and see if the tire is jumping.

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    O U 8 1 2 Spaz's Avatar
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    Quote Originally Posted by JayTA98 View Post
    nope, i replaced those a long time ago with polys
    how about the other bushings???

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by Spaz View Post
    how about the other bushings???
    LCAs,panhard bar are all polys, and the sway bar ends i replaced for polys too. I havent done the one that connects the sway bar to the rear end. The TQ arm is poly as well. any others i should check?
    Last edited by JayTA98; 06-23-2011 at 07:19 PM.

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    Spaz is My Mentor SMWS6TA's Avatar
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    when's the last time you changed your rear shocks? Stock?

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    Visualize°Design°Create SSwt00SS's Avatar
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    sounds like the classic case of wheel hop as already stated.

    it simply binds all the suspension components until something gives and wheel hop occurs.

    i would imagine in reverse it could be pretty violent in terms of all the shaking, vibration and noise.

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    Electrical Engineer KMdef9's Avatar
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    Mine wheel hops like this too, so I think it's normal as well. Except I was trying to found out how fast she was in reverese lol.

    It's scary b/c it's significantly louder than a forward wheel hop. Maybe b/c it's pulling instead of pushing? Hard on the LCA's and panhard b/ you hitting them from an opposite direction? Pulling the trans instead of pushing it? Tires worn in the opposite direction, so it's similar to fresh tread?

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    Sounds like driveline slop to me.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    when's the last time you changed your rear shocks? Stock?
    i change them last year but they got abused sometime because of the lowered springs. The car was bottoming out alot. thats why I went back to stock springs. I thinking about changing them. i put some crappy gabriels in it last time.

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    Senior Member JayTA98's Avatar
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    Quote Originally Posted by cammed goat View Post
    Sounds like driveline slop to me.
    what does that mean?

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    The play in the rearend. The clunk that you hear when you hit the gas pedal.

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