[BadToTheBown]

I have a 2.4 six with a 901 trans. I bought assembled from a reputable guy I trust. Clutch worked for a little while (race car), 2 times out, now it grinds bad going into 1st and it started this on my last day at the track...trans is now out, clutch is off, this is all I see...
-Sachs aluminum 225mm pressure plate, Kennedy 6 puck disk, stock flywheel, 6 crank bolts, some bluing on pressure plate and flywheel, not burnt
-flywheel depth measures within 0.010" of spec (quarter of a mm)
-Disc measures 0.23 mm thicker (yes, thicker) than spec and obviously has life left in it
-disc spline center mounting rivets are rubbing against one bolt obviously, maybe a touch on a couple of other, the bolt that is rubbing is not backed out
-lube on pilot, not on splines
-throwout actuates freely

I do not know if the flywheel is too thin (haven't taken it off yet) but doubt it.

I'm wondering if this rub is slowing the input shaft enough to prevent synchronization, hence problem going into gear.

They ONLY idea I've come up with is the flywheel is iffy thin and the disc wore enough to matter but very open to suggestions...ideas?