This past weekend I used my '95 F-150 to haul an overloaded trailor. I realized afterwards that there was probably to mutch weight on the trailor. After the hauling was over the problems started. By the way it is a five speed manuel transmission. Well the first problem was when I shifted into first gear or reverse then there was extreme shuttering and I had to raise the RPM's allot higher than normal just to shift. I drained some of the transmission fluid and refilled it. That seemed to help a small amount. Well today when I took the trailor back it was worse off than before. To make a long story short about 10 miles down the road after pulling out of a parking lot with the trailor I went to shift from first gear into second when I heard a loud snap and the clutch pedal would not come back up. I left the transmission in neutral and check on the master cylinder fluid. It was at the normal level so I got back into the truck and when I wen to shift the stick just moved around freely. I can no longer shift into any gear but I can turn the engine on and off and the clutch moves as normal now.

 

Sounds like something let loose on the clutch like the pressure plate. It might be time to replace the clutch kit.