While drivin the jeep today, 1997 TJ 2.5 liter manual, I kept getting a litle grinding when down shifitng into second gear. Figured I would test all the gears 3rd, 4th, and 5th were good and then I went from 2nd to 1st gear at about 15 -20 miles an hour. The beast jumped a little bit came to nuetral and I lost complete pressure in my clutch pedal. I checked the resevoir and have fluid in the master cylinder. There are no signs of leakage from the master or slave cylinder. Does anyone have any idea on what it might be or how I can trouble shoot without going and buyign alot of parts I don't need nor have the money for?