Define "no Clutch"
Can you push the pedal down all the way?
If so with engine running/truck stopped and clutch pedal is out all the way can you shift gears?
If so Clutch disc worn out, pressure plate stuck out, slave IN hose blocked so fluid can't get out and back to master
Is the pedal stuck at the top and you can't push it down?
Quick disconnect has come off
Is the clutch pedal loose?
Push rod has come off or pivot point has broken