Hello,

I'm getting ready to throw some parts at a problem on my '89 300E and would
appreciate some advice.

I replaced the front flex disc a few months ago and am still (or perhaps
now) getting some weird harmonic vibration in the drivetrain when cruising.
Thought it was the tires so I replaced them and turned out I did have one
with tread separation but I still have the vibration.

Now I'm going to pull the drive line and check the support bearing and rear
flex disc--and here comes the question.  What's the driveshaft bushing all
about and how likely is it that it's part of my problem.  Also, any comments
about where else the vibration could be coming from would be greatly
appreciated.

Thanks,

Mike