Hi,
My month old to me 87 syncro had a bad vibe.  Since I work on the navy's
MH-53E helicopter which has 11 driveshafts in all I suspected a driveshaft
vibe.  So I went and removed the center driveshaft. This vibe was most active
at the 40-50mph mark.  Then settled out after that. After removing the
driveshaft the vibe was all gone.  Upon inspection of the item I noticed the
rear u-joint was sticking on one axis.

  Has anyone else had this problem?
  Has anyone replaced the u-joint since the driveshaft is non-serviceable
part?
  Any other thoughts?

Kurt Thomas
87 syncro