93 Navajo = Mazda 5 speed tranny
Most likely it is the slave cylinder and it's time for a new clutch.
It could be the synchro's inteh tranny, but I doubt it.
The hydraulic internal slave cylinders in these things are the worst part of your whole truck!
The problem is it cant be replaced without dropping the tranny, and if your gonna drop the tranny then you had better replace the clutch pack, pilot bearing, and have the flywheel surfaced.
You can try having or bleeding the clutch, but it probably wont have any air trapped in the line unless the clutch has been replaced recently.
try searching these boards, you will find a ton of info.,,,
Also make sure your tranny is tight to the engine, if the bolts are not torqued properly then it can cause this.
Also you can tell alot by looking through the inspection cover onthe tranny with somebody running the engine and depressing the clutch pedal. If you know what to look for then this is the best place to start, measure how far the slave cylinder is traveling, or have a tranny shop take a look for you...
I had my Mazda 5 speed rebuilt twice and went through 4 clutch's in two years, including a custom keval clutch I had built, part of this is due to crappy aftermarket rebuilds, the fact that it's a Explorer drivetrain in a BII (was never right) and because I tow a boat. I have since converted to an Automatic and couldnt be happier to have no more clutch pedal....
