Need some help
when it's not giving you problems, how's the pedal travel, feel?
if it's soft, try bleeding it first and see if the problem resolves
otherwise swap out the master, if it's still giving you issues move to slave
it's grinding cause the trow out bearing isn't pushing the pressure plate fingers in enough, which eludes to hydraulic issues, when the pressure plate fingers are depressed and the engine is disengaged the drive shaft is driving the transmission, in order for the synchros and blocker rings to work properly and smoothly that action has to take place, if it's not fully disengaging then the synchro mechanism doesn't work properly and the synchro teeth are ground down (they're softer than the gear teeth that they mesh with and that's the grinding sound you hear), don't drive it hard until you address the problem
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