I recently just bought a 2000 Jeep Wrangler Sport from my uncle that had 113,000 miles on it and still in perfect condition. He just replaced the clutch last year and oddly enough he got it from Advance Auto Parts.
Long story short, the clutch plate had broke and one of the springs had popped out causing my Jeep to die on me around the corner from my house. So on Saturday my uncle and I spent all day tearing the transmission apart and rebuilding it with a new clutch plate in! Hopefully this one will last longer than a year! (and it was bought from O'reillys not Advance!!!)
And for any others regarding symptoms, I couldn't put it into any gears what so ever and my clutch went from soft to very difficult to push down. Noticed on some threads that it might be the clutch plate sticking and something is wrong with the slave cylinder, however that was not the case for mine. Either way you would need to open up your transmission to see if the clutch plate is sticking, but also look to see if maybe one of the springs popped out.
Just glad its all good and working now!