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Loud "THUMP"

This is a discussion on Loud "THUMP" within the General Help forums, part of the LSx Technical Help Section category; 98 Z28 Shift from R to D there is a loud thump. Sounds like the tranny is jumping up, transmission ...

  1. #1
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    Loud "THUMP"

    98 Z28

    Shift from R to D there is a loud thump. Sounds like the tranny is jumping up, transmission mount is solid, rubber mount looks good. Someone suggested a trailing arm bushing on top of the transmission at the tail shaft area. ???

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    Senior Member bigrondownhiller's Avatar
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    1996 Camaro Z28 vert

    do you feel the thump or just hear it? could be u joints or a bad ring and pinion.

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    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    wheres the u joints and ring and pinion? Is that from the drive shaft to the diff ring/seal?I have the same problem but mine thumps at slow downs and slow take offs as well.

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    Senior Member bigrondownhiller's Avatar
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    the u joints are at either end of the driveshaft. usually the rear one goes first. the ring and pinion are inside of the differential.

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    Quote Originally Posted by bigrondownhiller View Post
    do you feel the thump or just hear it? could be u joints or a bad ring and pinion.
    I can feel it in the floor, its not u-joints, already checked the drive line.

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    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    have you checked the torque arm bushing?
    I replaced mine chasing this thump of ours, especially since you can feel yours in the floor

  7. #7
    Member mglangley21's Avatar
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    1999 Camaro SS(LS6 Swap)

    Have u took the transmission mount off to see if it has cracked or ripped away any at all, because my ss had a thump but u could not see it with out pulling it off!! And it was the trans mount!

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    Can I just buy the bushing, or do I replace the complete torque arm? Is it a oem item only or available form the autoparts stores?

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    The Bandit Wesman's Avatar
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    1998 Trans Am WS6

    Quote Originally Posted by 1badtk View Post
    Can I just buy the bushing, or do I replace the complete torque arm? Is it a oem item only or available form the autoparts stores?
    You can buy just the bushing.

    Speed Inc has them for $13.99, and they are made from polyurethane.

    Don't waste your time going to the auto parts store, doubt anyone will have it, and if they do it will only be a cheap rubber one anyway.

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    Thank you

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    2000 Trans Am

    When you shift from Reverse to Drive you hear a thump? Is that sound when it is trying to go into gear. Another words if you had it in Reverse and put it in drive and gave it some gas as it was being shifted into drive would you hear the thump and then have the car jump forward as it engages? It sounds like that automatic transmission might be showing early signs of slipping when changing gears.

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    Well I looked at the tranny mount and torque arm mount, both are ok. The sound is coming from the right rear area, and I noticed the car is sitting 1" lower on the right side. Going to look at the shock mounts and shocks next.

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    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    LOL I have the same uneven drop as well as a few others. You figure that one out and you win a nice prize...or a heart felt thank you hahahah

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    TIMMMMMAY TX_WS6_02's Avatar
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    Quote Originally Posted by 1badtk View Post
    Well I looked at the tranny mount and torque arm mount, both are ok. The sound is coming from the right rear area, and I noticed the car is sitting 1" lower on the right side. Going to look at the shock mounts and shocks next.
    Right before my rear went out...i experienced that THUMP. It made my center console jump. Felt like someone took a sledgehammer to the underneath of my car...they said that the bearings went out. Hope whatever you find out isn't gonna cost you out the wahzoo

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    Black
    2000 Trans Am

    YOu are hearing this sound when you shift from Reverse to Drive only? Everyone is pointing away from the tranny. I thought tranny because your problem seemed to be happening when you shifted so I must have misunderstood your problem. If you are having a problem in your rear differential somewhere then thats another story. Is everything stock under your car? make sure the exhaust isnt hitting the crossmembers. That can give you a thump sound. Actually this one should be really easy to fix. You should take a quick peek underneath your car and feel around everywhere to make sure everything is nice and tight. If its coming from your rear however then it sounds like something in your differential..... Make sure your driveshaft and yolk are all good and tight.



    Quote Originally Posted by 1badtk View Post
    98 Z28

    Shift from R to D there is a loud thump. Sounds like the tranny is jumping up, transmission mount is solid, rubber mount looks good. Someone suggested a trailing arm bushing on top of the transmission at the tail shaft area. ???

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