Today I got under my truck and looked... no obvious leaks or stains, the fluid in the clutch master was just a hair below the inside step and I topped it off. The pedal linkage does not have any unusual slack, no deflections or creaks/pops, firewall is not visibly moving.
But the end of the fork is moving only half an inch (or even a bit less) with the pedal to the floor. And since the inspection cover is missing, I can see the pressure plate is barely twitching. Obviously not disengaging the clutch since it won't go into gear sitting still (and grinds reverse). I suspect it's time to get a prebled master/slave setup and pop it on.
Meanwhile, does anyone know what the fork travel should be?
In my experience most clutches need the outer end of the fork to move closer to 1". If what I'm seeing is normal then the problem may be inside the bellhousing