Have you blown up a South Bend yet?

[crawler]

Hey guys I'm kind of disabled at the moment. I was coming to a turn at about 30mph and I downshifted from 4th to 3rd and was dead in the water. As soon as I let out on the pedal all I got was a grinding noise and no go what so ever.
If i let the truck idle in neutral it has no odd noises.
Depress clutch I have normal pedal feel.
Release clutch normal pedal feel.
Depress clutch put truck in gear just like normal no forcing it. Release clutch and I have grinding and no go.
I can shift into 3rd,4th,and 5th without the clutch at a complete stand still with very little resistance. But of course as soon as I do I have grinding. There is no odd feeling in the shifter the pedal or anywhere for that matter.
It just doesn't go anywhere and it has that light grinding/slipping sound.

Update-This morning after everything sat overnight I messed with it a little more.
If I barely let out on the clutch in 1st the truck will roll forward(on flat surface) If I let out anymore than a few inches from the floorboard then there is instant grinding and no movement.
This makes me think that the input shaft isn't broken. But the shaft and the clutch hub could be stripped. The center may have broke out of the clutch. The springs in the center popped out. Etc...
Point is I don't know and I can't get it in my buddies shop until Wednesday. I was hoping to get an I dea on parts I might need so I could maybe have them here when I got the tranny pulled.
By the way I haven't towed anything with this truck since November and I don't drag race. I was told this clutch would hold. Maybe they should have suggested the 13" clutch instead.
Sorry to rant.