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V6 auto vibrates in 3rd gear

Discussion in 'VN - VP Holden Commodore (1988 - 1993)' started by mischf, Jan 22, 2007.

  1. mischf

    mischf New Member

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    Does anyone know why my car would vibrate in 3rd? 1st and 2nd are fine, then as soon as it goes into 3rd and i go above 60ks, the whole car starts to vibrate, and it gets worse the faster I go till I hit 4th, then it disappears (I 'tested' it up to 140 in 4th and there's no vibes). I think it is either the gearbox, or, at that speed, the ratio of flywheel rotations to driveshaft rotations is causing some kind of resonance....


    ??????
     
  2. mischf

    mischf New Member

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    ?????????????????
     
  3. greenfoam

    greenfoam New Member

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    My V8 does the same thing, in 3rd only, it's worst under load at around 100-120 it's running smooth again somewhere before 180. I suspect it's the rubber mount at the back of the gearbox, I'll be replacing mine soon so I'll let you know it that fixed it
     
  4. nathans1987

    nathans1987 New Member

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    i think its a common problem my mates does too. if its a speed thing its probably tailshaft. change oil see if that fixes it
     
  5. Pretender

    Pretender Brain function fading .

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    My car has now developed a shudder in third. It is very mild but I notice it though my wife does not.

    Any news on the rubber mount replacement?
     
  6. greenfoam

    greenfoam New Member

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    I have the mount but haven't put it in yet, but the uni joints might be a bit worn too. It wont be far away :) (the mount)
     
  7. andynogo

    andynogo New Member

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    That loverly CV joint in the tailshaft can do all sorts of weird things too. Had to replace mine after it started to get a speed related vibration.

    Ain't that cheap either!
     
  8. Morton

    Morton For external use only

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    I get a vibration in 3rd too. Always have, and never thought much of it... interesting.
     
  9. somefool

    somefool New Member

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    THREAD DIG. I get the same thing now. It started doing it a week or so ago, only under medium acceleration.
    I drive like a grandpa normallly but in traffic when i need to get to the speed limit a tad faster: 2000rpm and untill it shifts into 3rd i can hear this insane vibration and i can feel it through the accelerator. Once it's in 4th/overdrive/whetever it is it is fine and smooth again.
    My boss said it was the synchros wearing out and that sooner or later the box will need a rebuild :(

    have you guys fixed / figured it out since 2007? lol
     
  10. Warranty Void

    Warranty Void Take it apart? Me? No!

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    I have always had it, I've recently (this year) replaced the uni's, rebuilt the auto box, new torque converter, checked all the mounts for cracks/faults. Again, it's only in 3rd gear. I'm doing diff gears and diff re-race soon, but I don't think that's going to help.
    If anyone sorted this thing out I'd love to know how.
     
  11. mattw1992

    mattw1992 New Member

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    This is very similar to what i have in my VT any further info?
     
  12. immortality

    immortality Donating Member

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    It's a special feature. Holden were trying to improve it's female customer focus.....
     
  13. V85000i

    V85000i New Member

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    My VP V8 vibrates in 3rd too, feels like Tailshaft but thats brand new. Diff is brand new truetrac, Trans was rebuilt bout 30-40,000km ago and I think its always done it. Sorry to dig a thread but thought id add another one to the tally. So maybe its just the way they are
     
  14. immortality

    immortality Donating Member

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    You could play around with the drive shaft phasing and see if that alters where the harmonics are occurring.
     
  15. Circlotron

    Circlotron New Member

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    If the phasing was wrong I imagine it would vibrate in any gear, not just 3rd.
     
  16. immortality

    immortality Donating Member

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    Possibly. Vibrations tend to show up at certain speeds probably due to harmonics?

    You could also look at suspension bushes in the rear. With old bushes you can have a change in the angle off the diff which would could cause issues with the drive line.
     

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