322,000?
Quitcherbitchin!
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Seriously, with that kind of milage (how many on the clutch?)I would suspect the following based on experience with other (non cummins) vehicles.
worn pilot bushing
worn splines on input shaft
worn splines on clutch disc
corrosion (rust) on splines causing sticktion
old oil (leaked) on to splines (sticktion)
input shaft bearing worn
throwout bearing corroded/sticking
When you take it apart to check it, allow time to repair the worst of the above problems. Replace the clutch disc since you have it apart. CLOSELY inspect everthing until you find the source. If it is the input shaft bearing (which may get taken out driving with a bad pilot bushing), you can damage the trans if you drive it too long. I saw a post awhile back about kevlar pilot bushings that claimed very low wear rates-might want to check out.
Good Luck
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'94 3500 4x4, 201,000 miles, Never had a cat, Auto w/shift kit (currently under remodification), 3. 54 Gears, TST #5 plate, 235-85-16s, Rancho 9000s w/remote, Isspro gauges inplace of cupholder & Amsoil Bumper to Bumper. NRA member.
"Warrantee? We don't need no stinking warrantee!"