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Whole car vibrates at 70-up

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Old 09-23-2011, 06:24 PM
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Default Whole car vibrates at 70-up

I had a small wreck a few months back I clipped a tree root at about 40mph and I bent my suspension on the passenger front side and broke both passenger wheels well i replaced the passenger front suspension and both wheels and now the car shakes/vibrates pretty bad at anything above 70mph and gets worse the higher the speed all the plastics inside vibrate horribly anyone know what the problem is? Any help would be appreciated


Car is 98 z28 m6 bone stock except for 4:10's and flowmaster muffler
Old 09-23-2011, 07:23 PM
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Could be a few different things. Check your torque arm, and drive shaft is where i'd start. May not be your problem though. We're kinda diagnosing the same problem on a friend of mines car but his hasn't been wrecked. Lq4, 4l80e swap. We tried the torque arm and got some vibration out but not enough. I think he's gonna get a longer driveshaft next. Like i said that may not be your problem though. Could've broken a motor mount too on the passenger side.
Old 09-23-2011, 10:37 PM
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I don't think it would be a motor mount I think there would be alot of other problems
Old 09-24-2011, 05:03 PM
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What does it take to get a answer around here. mabye this will help
https://ls1tech.com/forums/attachmen...1&d=1316902236
Attached Thumbnails Whole car vibrates at 70-up-cktfjl.jpg  

Last edited by 6898camaross; 09-24-2011 at 05:11 PM.
Old 09-25-2011, 04:22 PM
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I had a similar problem and it ended up being my tires weren't balanced. Sounds simple, but something to check.
Old 09-25-2011, 05:23 PM
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Originally Posted by skopers3
I had a similar problem and it ended up being my tires weren't balanced. Sounds simple, but something to check.
I was thinking that. how bad did your car shake?
Old 09-26-2011, 09:17 AM
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Originally Posted by 6898camaross
I was thinking that. how bad did your car shake?
Violently. I couldn't drive more than 55 or the passenger seat would be shaking like crazy. I would have never believed something so bad could jsut be from that.
Old 09-26-2011, 10:19 AM
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Tires being out of balance would be the first thing I would check. Somewhere with a road force balancer. When you got new wheels, did you get new tires too? I know when I put new tires on mine, the guy that did it I guess didn't pay attention or care because I took it back a couple times from it shaking and they never could get it right. I took it to another shop and they balanced them and now no shaking. Good luck man.
Old 09-26-2011, 05:05 PM
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Yea I got new tires I'm gona go get them balanced and see if that helps I never thought it would shake that bad from a tire but I'm goin to do that and see
Old 09-26-2011, 09:53 PM
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Did the balance fix your problem?
Old 09-30-2011, 05:48 PM
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I didn't read anyone mention trans mount, they are made of rubber and they are not strong enough for the power the car makes.
Old 10-02-2011, 01:24 AM
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could also be out of alignment, or possibly the wheel bearing. although bearings typically make the most god awful noise when they are damaged enough to cause the vibrations you describe (ask me how i know)
Old 10-03-2011, 01:15 PM
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change your universal joints it's cheap and never could hurt




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