My wild guess would be that the clutch is fine but the pinion gear or ring gear has problems? :noidea::noidea:
I sure do hope your wild guess is wrong. Is there any way to inspect either one of these? I may go for the pinion being messed up, however we pushed it off with my 7 and used it for a few minutes. It is still doing the same thing. So, I don't think the chances are very high that the ring gear stopped in the same spot. Although I could be wrong. I may try to bump it to turn the diesel a little and try again. Wow, if it is the ring gear, this thing may be going bye bye.