Just Commodores Forum Community

It takes just a moment to join our fantastic community

Register

Knocking Noise from under the car.

Discussion in 'VB - VK Holden Commodore (1978 - 1985)' started by SoulGrind, Apr 18, 2009.

  1. SoulGrind

    SoulGrind §ôµÏG®ïñD

    Messages:
    68
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Aug 28, 2004
    Location:
    Melbourne
    Members Ride:
    VX SII Calais - VF SSV Redline
    Hello all, I've got a strange problem, my gf's VC commodore has a strange knocking noise coming from under the car.
    I've checked to see if theres any movement on the tail shaft and theres none, i've replaced all the rubber mounts for the exhaust. Yet the knocking happens only when there's more then 1 person in the car (more then the driver etc) I know the noise is coming from the tail shaft somewhere, but i can't pin point it.

    Any ideas?

    Cheers.
     
  2. SL/ENUT

    SL/ENUT The SL/E Fanatic!

    Messages:
    1,898
    Likes Received:
    57
    Trophy Points:
    48
    Joined:
    May 28, 2004
    Location:
    Burnie, Tasmania
    Members Ride:
    VB SL/E 5L and VC SL/E 3.3L
    centre bearing rubber probably gone.
     
  3. ari666

    ari666 250,000 hits

    Messages:
    11,828
    Likes Received:
    115
    Trophy Points:
    48
    Joined:
    Mar 10, 2009
    Location:
    melbourne
    Members Ride:
    1966 impala, R32 GTR
    is the car lowered? i.e. is the diff hitting the panhard rod when there is an extra persons weight in the car?

    i would be checking your floor pan with a person in the passenger seat, and a person rocking the car.

    the reason i say this is cos' when the panhard hits, it sounds like the tailshaft.

    my 2 cents anyhoo
     
  4. Not_An_Abba_Fan

    Not_An_Abba_Fan Exhaust Guru

    Messages:
    13,808
    Likes Received:
    401
    Trophy Points:
    83
    Joined:
    Aug 18, 2006
    Location:
    Bunbury, WA
    Members Ride:
    Strange Rover
    Most probably the exhaust hitting the panhard rod. When there is weight in the car, the body comes down and the exhaust moves down with it. There isn't a lot of clearance above the panhard rod, so I reckon the exhaust is hitting it.
     
  5. ari666

    ari666 250,000 hits

    Messages:
    11,828
    Likes Received:
    115
    Trophy Points:
    48
    Joined:
    Mar 10, 2009
    Location:
    melbourne
    Members Ride:
    1966 impala, R32 GTR
    duh, lol, yeah i meant to say exhaust. said diff. lol if your diff hits your panhard your in dire sh1t
     
  6. beware-brunette

    beware-brunette New Member

    Messages:
    52
    Likes Received:
    0
    Trophy Points:
    0
    Joined:
    Sep 24, 2008
    Location:
    Cairns
    Members Ride:
    VK SL
    We had the same issue with the vp, exhaust was knocking against something as it wasnt secured properly. Old parts had disintergrated
     
  7. vh2env

    vh2env jesse

    Messages:
    4
    Likes Received:
    0
    Trophy Points:
    0
    Joined:
    May 11, 2009
    Location:
    new south wales
    Members Ride:
    vh vacationer
    yerr i got a knocking noise from uder my vh too. dus it only happen wen u take off cuz if so its probably the centermount on ya tailshaft. thats wat mine iss.
     
  8. SoulGrind

    SoulGrind §ôµÏG®ïñD

    Messages:
    68
    Likes Received:
    0
    Trophy Points:
    6
    Joined:
    Aug 28, 2004
    Location:
    Melbourne
    Members Ride:
    VX SII Calais - VF SSV Redline
    Sorry for the late reply, just incase anyone else gets this problem.

    It ended up being the internals of the diff itself. I replaced them and all is good.
     
  9. ari666

    ari666 250,000 hits

    Messages:
    11,828
    Likes Received:
    115
    Trophy Points:
    48
    Joined:
    Mar 10, 2009
    Location:
    melbourne
    Members Ride:
    1966 impala, R32 GTR

Share This Page