I had my clutch replaced about 10K miles ago, but it's pretty much always "chattered." I did replace the slave and master cylinders, both of which made a world of difference in the ease of shifting. I did have to have the banjo of the master (slave) reversed when when the new cylinder was installed, since it was "wrong side up" with the replacement of the 10K clutch.
I'm thinking that I can live comfortably with the chatter, as long as it's not a sign of things to come. I don't push the car and only drive it about 1,000 miles a year, at the most.
Oh, yeah; it's an 86 GT, 4 speed.
Thanks!

Usually chatter in the clutch comes from uneven wear or clutches designed for competitive use. Assuming you don't have a racing clutch, it is probably uneven wear and won't get any worse now that you have the hydraulics working well.

Could also be a throw out bearing. They chatter and whine when they are failing.

Usually clutch chatter is caused by a contaminated clutch, like with oil on it. Also caused by some mechanical reason that the movement of parts causes the clutch to engauge and disengauge slightly when parts move. Not easily done with a hydrolic clutch, but common on mechanical linkages. You may want to check to see that you have zero air in the clutch system, a little bounch due to air in the system could make this happen or make it worse.

Yeah I second that. I had oil leak onto my clutch from a leaky rear main seal. Completely destroyed it.