It is self adjusting on a 89 Cherokee with a in line 6 4.0
yes
No
Not directly.Not directly.
from 89-95 yes.
YesYes
Yes it has one.
yes NO, The 89 uses a speedometer cable where the 92 is electronic.
I would start with the "Blue Book" value ( see link below ) and adjust from there by how the vehicle looks and runs.
They are 5.25"
You can't, there is no adjustment. Time to replace clutch, slave cylinder or clutch master cylinder. 1 of the 3.
Check the operating mechanism