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knocking from underneath??

This is a discussion on knocking from underneath?? within the General Help forums, part of the LSx Technical Help Section category; i've got this knocking from underneath my car and i cant figure it out . everything is tight as far ...

  1. #1
    old timer blue02Z's Avatar
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    Navy Blue Metallic
    2002 Z28

    knocking from underneath??

    i've got this knocking from underneath my car and i cant figure it out . everything is tight as far as i can tell. it only happens on off-camber situations like driveways and such. my exhaust hits but that is not it. it sounds like if you were standing on a dock in lake with a piece of wood floating and hitting the dock underneath. thanks everybody

  2. #2
    Veteran 0rion's Avatar
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    06 duramax

    does it do it on hard acceleration? Have you checked the tranny mount?

  3. #3
    old timer blue02Z's Avatar
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    na, its on slow manuevers. i did change the tranny mount a few months ago tho.

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    Senior Member Orcus79's Avatar
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    black
    2002 WS6

    Is it as you go over or stop on? IF ita as you go ever check that all your shocks are tight on the mounts, then move to the rest of the suspension. coul also be aloose body panel flexing and popping as well. The top on my Jimmy (fullsize with fiberglass top) pops when I go off camber somtimes, mind you i'm crawling out of ditch too when it does.

  5. #5
    old timer blue02Z's Avatar
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    Navy Blue Metallic
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    i dunno. i'm gonna put it on a drive on lift at work this week. thanks you guys

  6. #6
    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
    2001 trans am

    so what happened/ What was the culprit..cause I have the exact same thing going on!

  7. #7
    old timer blue02Z's Avatar
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    Quote Originally Posted by sic2001 View Post
    so what happened/ What was the culprit..cause I have the exact same thing going on!
    i'm going to try to check it out tomorrow. i'll post if i figure anything out

  8. #8
    Member Jon7I2's Avatar
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    Yeah, i have a similar problem, and would like to know what u found out too

  9. #9
    old timer blue02Z's Avatar
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    hey, sorry for the delay. i could not figure it out. everything is tight and nothing seems to be rubbing. i got under hit and grabbed and hung on everything. it all acted the way it should. i'm stumped. maybe when i put on the sfc it'll go away

  10. #10
    old timer blue02Z's Avatar
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    Navy Blue Metallic
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    i've been reading on bmr's website and i think the rear control arms are not tight enough. i'll find out and let ya'll know

  11. #11
    old timer blue02Z's Avatar
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    it was the control arms in the back. i anchored those bitches down and it went away. hope this helps

  12. #12
    tattoo artist,esquire sic2001's Avatar
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    navy blue metallic
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    I had mine welded a few months ago so it SHOULDNT be that but Im gonna take a long ass rachet-bar to em and tighten em up..without breaking them, since Ive got a little experience on thart score as well hahah
    Good looking out on the reply post too!!

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