'91 Original clutch 75K miles. Replaced the slave assembly 35K miles ago. Starting to feel like its going again. Symptom is a couple of tough attempts at shifting into1st, with resistance. Then I expect it will get worse and eventually not be able to shift into first where I'll have to drive in second. I've been through this before and am anticipating that's what will happen. Not yet time to worry, I'm being proactive.
Does it sound like the slave again, and not some other component?
How long does a slave clutch assembly last in a Miata?