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Feel vibration when holding brakes on a hill.

This is a discussion on Feel vibration when holding brakes on a hill. within the General Help forums, part of the LSx Technical Help Section category; I have noticed that my trans am started vibrating when in drive on a hill sitting still. I just noticed ...

  1. #1
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    pewter
    99 Trans Am

    Unhappy Feel vibration when holding brakes on a hill.

    I have noticed that my trans am started vibrating when in drive on a hill sitting still. I just noticed it about two months ago. it is not missing runs great but it fells as if the engine or exhaust is touching something. I have looked, but I don't see anything touching. what could it be ? NEED HELP. Could it be a motor mount?

  2. #2
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    '02 WS.6 / '07 Suburban

    Trans or motor mount would be my first thought, followed by the exhaust beneath the driver side floor pan or up over the rear axle.

  3. #3
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/a little mods...

    Motor mount would show on hard rev or acceleration. Trans maybe but it could be a worn out exhaust hanger.


    Is there a metallic sound in vibration or just a shutter?

  4. #4
    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
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    Also agree with the motor/trans mount.


    extreme dimensions, driveshaft shop, harrop, hid(35watt/6k) lows, hurst, k&n, led fogs, maverick man, mishimoto, nitto, revshift, slp, stern st-1, smoked sidemarkers, whiteline poly radius rod bushings

  5. #5
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    pewter
    99 Trans Am

    Needed muffler, replaced it, but I believe its the motor mounts ,holding the brake and raising the engine in drive the engine raises up about 1inch and the same in reverse. I was thinking about getting new mounts and going with Energy poly mount inserts,will they be too harsh for a daily driver? The car is a 99 ta with 47,000 miles I would think the mounts would have last a little longer,but the trans mount gave out at about 45,000.
    Last edited by Street Fighter; 07-15-2017 at 05:05 AM.

  6. #6
    Spaz is My Mentor SMWS6TA's Avatar
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    Poly mounts are ok for a daily, hell I almost daily mine with a 403. I have those exact poly mounts. Been pretty good so far.

  7. #7
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    I couldn't really feel any difference after installing poly engine mounts, but I made a bunch of changes all at the same time too. My only issue was the poly trans mount. Seemed to transmit a bunch of vibration into the driver compartment, so I swapped the stocker back in and it immediately went away.

  8. #8
    Spaz is My Mentor SMWS6TA's Avatar
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    Mine is still the rubber mount on the tranny too.

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