dsrtrat4if you can move the clutch bell enough to see the shoes something is wrong. Take the bell off and check the shoes for overly rounded edges or signs of extreme wear. Check the springs as well to make sure they arent broken. If the RPMs are coming up but the truck isnt moving its 99.9% a clutch problem. Also check the slipper clutch. If your still not sure take some pictures and post them and we can point it out from there. Oh and welcome to the forum.

Straick what engine is that again?