'76 c30 BAD clutch chatter and issues

[kamel]

So, having driven several trucks with the same trans, sm465, this one seems to have a characteristic unlike any others. The clutch only seems to work in two positions, in and out. Any in between finessing causes horrid chatter and clunking. It still grabs a little, but is not smooth by any means, I know it's a mechanical clutch, but it shouldn't be doing this. My thoughts are flywheel bolts are loose, flywheel is out of true and needs resurfacing, and clutch parts are loose or a combination of these. It also has a gnarly clunk rattle that is RPM related, noneffective of speed, but does not do it nearly as bad free reving.

Any help or advice is appreciated.