Re: Bad vibrations

[Angus Holliday <trstag@domain.elided>]

At 05:45 PM 6/11/99 +1000, you wrote:
...
>
>When I first purchased my 76 Stag, I noticed it has quite a noticeable
>vibration (more seemingly from somewhere in the drive train) at speeds over
>100km/h (not really noticeable from 0-80km/h).
Is the vibration at car speed or driveline speed?  Try running the car with
the rear end on jackstands (observe safety precautions,blah blah)
to isolate it from front to rear.

 After some initial
>inspections we did most of the obvious things such as wheel balance (front
>and rear) and new tyres. This did not cure the problem. I then had the tail
>shaft out serviced and rebalanced.
What is a "Tail shaft"?  A  'roo part?


. I was wondering if rear wheel alignment may have anything to do
>with causing a vibration such as this
No.

. Someone else also suggested that
>rear brake drums occasionally can go out of round (and hence cause
>vibrations) and if anyone has had any experience or knowledge of this I
>would be most interested.
They would cause pulsing under braking...


>
>Any suggestions, comments welcome !!
Two things I would look at would be 1) the drive shaft "Timing"  ie are the
u-joint in the same plane ?  with the 
STAG driveshaft (propshaft) the rubber can deteriorate (perish) allowing the
u-joints to go out of time
2) suspect the U-joints themselves ,particularly the ones on the 1/2 shafts.
and you might as well check the RW bearing while
you are at it.  The UJ should move thru it's full range of movement without
feeling "notchy".


Walter
Stag Specialists N.A.
520 792 0294