I have the same problem and my bushings check out OK per Bentley. My upper
boots were torn  but the joints were good so I found some boots that would
fit.. they failed within 2 months. A couple of months ago there was a thread
on this topic.
For a Synchro there is a clearance shown in Bentley determined by the
thickness of the eccentric adjuster washers. I was told that these different
thickness washers applied to the non-Synchro's also (although not shown to be
so in Bentley). When I had the upper arms off I greased everything and
torqued them back to 50ftlbs.with the car on the ground. Still squeaked,
still looking for a solution.

Ken Hunter
82 Westy 1.9D
84 Jetta 1.6D
89 Mitsubishi van