I just bought a 92 f150 4x4 4.9 m5od the previous owner said clutch was shot I moved it in the garage it was barly moving it was slipping so bad. I pulled the clutch out and it isnt very warn at all why would it slip so bad it has 90,000 on it?

 

Maybe a worn pressure plate? As in weak/broken springs.. Clutch pedal linkage binding,,,

 

Assuming no fluid has leaked on to it then it may be that the pressure plate springs are shot.
White beat me to it.