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Wierd noise and vibration??

This is a discussion on Wierd noise and vibration?? within the Automatic Transmission forums, part of the Drivetrain category; Automatic 99 firebird. if you floor it or give it 1/2 @ pedal a weird noise like grinding and vibration ...

  1. #1
    Member flybird's Avatar
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    Wierd noise and vibration??

    Automatic 99 firebird. if you floor it or give it 1/2 @ pedal a weird noise like grinding and vibration are comming from the middle of the car??

    Look at your center console, its comming from right around that area. Ideas??

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    Senior Member Too Fast's Avatar
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    driveshaft rubbing due to improper mounting of eng/trans, bad u-joints, cross-member not isolated, differential issues, engine component touching the body under load, exhaust touching body under load. Really, something like this is rather hard to help with.

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    Busted torque arm mount.

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    Senior Member Too Fast's Avatar
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    ^^^

    yup, he confirmed that on his poor MPG thread.

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    Member flybird's Avatar
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    ^^^^ yeah trying to narrow everything down to possibilities. The bad torque arm can cause bad mpg is what your saying yes?

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    Nope. A bad torque arm mount will result in clunks and bangs emanating from under the car and there is a potential for it to cause other damage if not fixed.

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    Jeff is spot on. Get your torque arm mount fixed before it takes out something with it.

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    Senior Member Too Fast's Avatar
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    Quote Originally Posted by flybird View Post
    ^^^^ yeah trying to narrow everything down to possibilities. The bad torque arm can cause bad mpg is what your saying yes?
    No I wasn't saying that.

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    Member flybird's Avatar
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    Quote Originally Posted by Too Fast View Post
    No I wasn't saying that.
    hey man sorry i just saw your respond. I wasnt exactly paying attention to what you said but yes i know what you were saying. My fault. Also i have pics bout to upload. I dont exactly know what to look for. So here is the torque arm mount and some of the dtrain.

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    Member flybird's Avatar
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    Here is a link to all the pictures. LS1 wont let me upload photos bigger than 1MB.... Much help is appriciated.


    Pictures by jongibson94 - Photobucket



    In the 10th, 11th, and 12th picture there is a round bushing that is severly rotten. Underneath the tranny it seems to look like. Not sure what this is?
    Last edited by flybird; 02-19-2012 at 08:23 AM.

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    The torque runs down the center of the car adjacent to the driveshaft. It connects at the transmission tailstock on the driver side in the front and to the differential housing in the rear. There is a clamp style mount with a rubber bushing and this is most likely what has let loose.

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    We posted at about the same time -- looked at the pics and the front torque arm mount appears to be intact. The transmission mount is a little odd looking to me -- grab the bag of your transmission and see if it is loose in the mount. There's obviously a bit of weight to it, but if the mount is fried you will be able to move it around by hand.

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    Member flybird's Avatar
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    Quote Originally Posted by pajeff02 View Post
    The torque runs down the center of the car adjacent to the driveshaft. It connects at the transmission tailstock on the driver side in the front and to the differential housing in the rear. There is a clamp style mount with a rubber bushing and this is most likely what has let loose.
    do you see this clamp style mount with a rubber bushing anywher in the pics so i know what im looking at?? (forgive me, im still learning lol..)

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    This is it:


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    Member flybird's Avatar
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    are you talking about the top left screen bushing or the bottome right?? As you can see its just.. rottened. So is the top left screen but not AS bad. Thank you for help sir, much oblied.

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    Top center of the pic is your torque arm bushing and it appears to be ok. There is a clamping bolt at the very top (can't see in the pic) that lets loose and the clamp then falls open allowing the torque arm to slap around.

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    Quote Originally Posted by pajeff02 View Post
    This is it:

    Click for full size
    That transmission mount looks rough as hell!!!!(bottom right of the picture! see if it can be moved easily!

  18. #18
    Member flybird's Avatar
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    mount dont move. The bushing that connects from mount to tranny is rough looking. Jeff seems to be saying the clamp could be loose.

  19. #19
    Member My00Z28's Avatar
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    that is possible but kinda unlikely imo but i dont know? but the bushing that connects the mount to the tranny is what holds it if the bushing rips the trans is loose! under throttle the trans will want to lift if the mount is bad then the transmission lifting would throw off your driveshaft angles causing a vibration and noise, increasing with speed!!!
    Last edited by My00Z28; 02-19-2012 at 07:17 PM.

  20. #20
    Member flybird's Avatar
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    Ill use more muscle into it. Couldnt I just replace the bushing and not the whole mount? Mount not cracked or broken... Just bushing.

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