5000TQ trany noise under lock

[Denis]

  Hi .

  I jacked the car on 4 blocks and lock- unlock.... no sound at all everything normal. The wheels locks and unlocks easily without anytrouble.

  So only 1/4 to 1/2 too hight on the diam is enought to make trouble on Quattro tranny.

  thanks

  Ðenis
    ----- Original Message ----- 
    From: Ado Sigal 
    To: Denis 
    Sent: Friday, October 15, 2004 11:53 PM
    Subject: Re: 5000TQ trany noise under lock


    Denis wrote:

  T125 80 17 spare from a V8. When i ran with it the was no noise with the lock off.
  The 5000TQ is for 15 wheel and its too small.

  205 55 16 tires

  The noise is not there on lock at off.

  thanks

  Ðenis

  Consider that what is happening is normal, since diff is locked, any discrepancy in tire diameter or path length will be forcefully adjusted by slipping the tires no matter what, hence the vibration. For that reason the lock should br used only on loose ground, snow, mud etc., and not at manoeuvring speed. New cars switch the diff automatically at low speed, since the car is impossible to manoeuvre with lock on. I would say not to worry, but rather don't use the diff lock when it isn't needed.
    If you want to test it, lift the car all wheels up, run it with lock engaged and turn the steering. There would be no vibration at any speed and steering from lock to lock. Drop the car and just try to move it slightly with wheels turned and see what happens; same noise you've experienced before. If your car however makes any noise or vibration when of the ground, then things need to be investigated.

    Cheers,

    Ado