I have a 59 f100 that when starting to disengage the clutch its very chattery. Any suggestions where to start. Everything looks good. I have a new slave cylinder on it. The plates look to be free of oil and grease. The system has been bleed of air?

 

Release bearing hub?

 

Check your motor mounts. If they get loose the motor may be jumping around and just feel like a chatter. You may be able to just tighten the motor mount bolts.

 

i have also seen spring bolts loose on the rear end make it feel like it was the clutch if you weren't really thinking about it.