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Bad vibration at high speed?

This is a discussion on Bad vibration at high speed? within the General Help forums, part of the LSx Technical Help Section category; Since I got my Formula it has had a vibration at high speed. Once you get up past 85-90mph the ...

  1. #1
    Formulatastic yellowv's Avatar
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    Bad vibration at high speed?

    Since I got my Formula it has had a vibration at high speed. Once you get up past 85-90mph the whole car starts to shake. I got the wheels balanced and still had the same thing. Thought it might be a bad axle or carrier bearing. Rebuilt the whole rear down to new differential and axle shafts. Same thing. Thought I had a couple of bent rims. Changed the wheels and tires. Same thing. Any thoughts. Shocks, wheel bearing, tranny or motor mounts? It's weird because the car is solid as a rock until you get over 85 or so. It also feels like the engine might be breaking up and causing it sometimes. Maybe a bad harmonic balancer or something? It has new plugs, wires, fuel filter, air filter, etc. Any thoughs would be appreciated. Thanks.
    Last edited by yellowv; 04-13-2007 at 11:28 PM.

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    Light Metallic Pewter
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    Have you had it checked on Roadforce Balance Equipment?

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    Formulatastic yellowv's Avatar
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    Quote Originally Posted by mrm1149 View Post
    Have you had it checked on Roadforce Balance Equipment?
    No that was going to be my next step. The local Dodge dealer has one. They were the only place that could balance a set of wheels I had on a Mustang a few years ago.

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    Single Malt rbob93's Avatar
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    Have you considered a bad tire???
    Had a ply separation that wasn't visible once.....wouldn't give a shake untill at a certain speed

    Could try a different set of tires to eliminate the possibility

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    Formulatastic yellowv's Avatar
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    as I said in my original post the car has a brand new set of wheels and tires. It had the same vibration with both the new and old tires and wheels.

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    Nitrous Tuner LS2Tuner's Avatar
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    DRIVESHAFT.........

    You need to check it with a dial indiacator if possiable. Or as cheap as it is I would take it out real quick by only jacking up the rear so you don't loose any fluid and run it over to have it balanced. I get them dome for $30 out here.
    Don't be afraid of the bottle!!! Be afraid of your tune!!!

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    Formulatastic yellowv's Avatar
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    Quote Originally Posted by LS2Tuner View Post
    DRIVESHAFT.........

    You need to check it with a dial indiacator if possiable. Or as cheap as it is I would take it out real quick by only jacking up the rear so you don't loose any fluid and run it over to have it balanced. I get them dome for $30 out here.

    I was starting to think the same thing. I think my next day off i will pull it and bring it to a shop.

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    Impounded
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    do you have the steel driveshaft with the harmonic balancer or the aluminum shaft?

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    Senior Member slims00ls1z28's Avatar
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    +1 on drive shaft. Also check whether is is speed, rpm or gear specific.

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    Impounded
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    i picked up a vibration after installing a new auburn carrier,swapped it out for a torsen and the vibration was gone.i looked at the auburn carefully and couldn't find any signs it was balanced in any way from the manufactuer.what carrier is in your formula?

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    Formulatastic yellowv's Avatar
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    I have an aluminum driveshaft. The carrier is a new Auburn. I recently replaced an old Auburn and it had the same vibration with both, but there are tons of Auburn cars that don't have this problem.

  12. #12
    PFM
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    I'll go with axle bearings. I had a bad vibration and when I went with a rearend rebuild/upgrade to 3:73s the vib went away. All I ever saw wrong was bearing races that were out of round.

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    Impounded
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    see if someone will let you borrow thier steel drive shaft with the balancer.i'll never buy another auburn after my experiance with them.

  14. #14
    Formulatastic yellowv's Avatar
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    Quote Originally Posted by PFM View Post
    I'll go with axle bearings. I had a bad vibration and when I went with a rearend rebuild/upgrade to 3:73s the vib went away. All I ever saw wrong was bearing races that were out of round.

    All new bearings in the rear. Axle, carrier, pinion, etc. New axle shafts as well.

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