Rear Suspension noise

[Steve Sherman <Steve.Sherman@cyrix.com>]

This is minor (at least I hope so) but none the less very annoying...

Over the last few weeks my 86 5KTQW has developed a noise when the rear
suspension moves up and down.  It has been getting worse and sounds a
bit like the infamous slowly creeking door in a bad horror movie.

I've gone under the rear and and by putting my hand on various
suspension parts, localized the source...it seems that the upper "bar"
that ties the bearing carrier to the suspension is the culprit.  At
least that's the part that I can feel the vibration in when the moise
happens.  It doesn't take much movement to get the creek, a few mm of
motion can do it.

I've tried spraying the bushings with penetrating lube, without much
effect.

Any BTDT as to what is causing this.  I hate to the shotgun approach to
replacing parts here, but it is really annoying.  Could it be a rubber
bushing going?

TIA

Steve