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vibration in 3rd gear

This is a discussion on vibration in 3rd gear within the Manual Transmission forums, part of the Drivetrain category; I have a 99 trans am 6 speed tranny and when i am in 3rd gear only. I can fell ...

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    ls1devil lt1dragon's Avatar
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    vibration in 3rd gear

    I have a 99 trans am 6 speed tranny and when i am in 3rd gear only. I can fell vibration (chadder) through the shifter i can also hear this and it only happens in 3rd gear. Any suggestions would be appricatied

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    ls1devil lt1dragon's Avatar
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    well i took it to some transmission shops and the tranny is fine its the rear end. So i took it differential shop and they say its the ring and pin, plus joints they also said i should change my gears to 3.73

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    Senior Member ninobrn99's Avatar
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    as long as they can set them up right, go for it.

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    ls1devil lt1dragon's Avatar
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    would any one recommend getting the TA girddle cover also. Would this be a good investment

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    Senior Member ninobrn99's Avatar
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    yes...in a sense...its an investment and puts preload on the the rear, but leave the next weakest point vulnerable. Id still go ahead and do it though.

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    Quote Originally Posted by lt1dragon View Post
    I have a 99 trans am 6 speed tranny and when i am in 3rd gear only. I can fell vibration (chadder) through the shifter i can also hear this and it only happens in 3rd gear. Any suggestions would be appricatied
    Only happens in 3rd gear, and they think it's the rear end???? In my opinion, i would get a second opinion... It has been my experience that rear end vibrations or noise are present in every gear.

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    Fayhee Motorsports hotrod18_69's Avatar
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    Quote Originally Posted by hurtindude View Post
    Only happens in 3rd gear, and they think it's the rear end???? In my opinion, i would get a second opinion... It has been my experience that rear end vibrations or noise are present in every gear.
    Agreed.. All rear end issuesi have come across are in all gears.. Sounds like tranny issues to me.. Get a second opinion..

  8. #8
    M6 King Hot Black Trans-Am's Avatar
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    I wouldn't waste money on the stock 10bolt. If you do anything to the rear just replace it with a 12bolt or 9". Did you have the drive shaft checked? Maybe that could do it.

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    ls1devil lt1dragon's Avatar
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    well i got the new gears they put in AAM 3.73 the car seems to have a but more pep to it. There is no more whinning in the rear end any more but the vibration in 3rd gear did not go away. Any one think it might be the shifter

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    M6 King Hot Black Trans-Am's Avatar
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    I'd have the drive shaft's balance checked. It could be harmonics at certain drive shaft rpm. Try the same speed in 4th and see if it happens.

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    Awaiting Activation jsremmos's Avatar
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    I have an a4 and it also vibrates in 3rd and I have no idea what it is. if anyone knows why this would happen with an auto please tell me

  12. #12
    ls1devil lt1dragon's Avatar
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    yeah there is no vibration in any other gear just 3rd and it starts around 40 mph if i am in 3rd it will vibrate i will shift in to fourth or any other gear and it is gone. the car does not shake or any thing just the shifter. I have no idea but maybe it could be the drive shaft i should get it checked out next

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    98 trans am F-Bomb's Avatar
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    if you have a stahl converter make sure it is in the grove correctly compleatly snapped into place 2.25 spline out of the converter is what it need to be any thing longer will create vibration

  14. #14
    98 trans am F-Bomb's Avatar
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    chameleon
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    if you have a stahl converter make sure it is in the grove correctly compleatly snapped into place 2.25 spline out of the converter is what it need to be any thing longer will create vibration

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