I have a 1992 Ford F150 with the 4.9 liter I-6 and a 5 speed manual transmission. While at my MIL's house today, I pushed in the clutch pedal, heard a sickening crunching\popping type sound, and my clutch pedal is now stuck halfway through it's travel range. I push on it, and it will not go all the way to the floor. I lift it up by hand, and it sinks back down to the halfway point.Long story short, I had to call my uncle to come down and pick up my wife and myself, and my truck got a ride home on the neighbor's flatbed wrecker ( I am still thanking him for the free tow, he did me a serious solid!). Do any of you have an idea as to where and what I will need to check to hopefully find the source of the problem? It's not that I don't know how to work on cars, it's that I have never encountered this before, and have very few ideas where to start searching for the problem.

The only things I can think of so far are:
1 The master or slave cylender. My wife and I checked the fluid level, and it was good. I will loosen the nuts and bolts and check them on the next dry day.
2 The actuator rod or the return spring on the pedal assembly. It was dark and raining, I couldn't get a good look at it tonight, will try to check it tomorow.
3 Internal damage to internal clutch components. I could check this in the driveway, but I feel sending it to the shop might be a better option as they have a better selection of tools and a warmer, dryer work enviroment.
If any of you guys and girls can think of anything I have missed\not thought of, please let me know. Living in the northeast, this time of year is the end of the motorcycle season, and we are down to one truck until I can afford to fix it\get it fixed (given the fact that I am mediclly retired and on social security, money is very tight). Thanks in advance for your help.
And yes, I do know that FORD stands for fix or repair daily.