[Mgs] Drive shaft balanced

[Hans Duinhoven]

Hi,

After some tests at several revs of the engine and speed I finally found, 
that some vibrations between the speed of 50 and 70 m/h are caused by I 
think an unbalanced driveshaft between the gearbox and the differential 
gear.
What is the cause of this?
Can this be rebalanced and if so - how?
Is it easier to replace the driveshaft with a used one instead of 
rebalancing the one, which is on the car?


Cheers,

Hans
71 BGT
no overdrive