Grind going into third, drivetrain woes

[clean2g]

I have a slight grind going into third, but I can't tell if it's the tranny or the clutch/tob/fork. It doesn't grind all the time either. The clutch is slipping a bit at high rpms if I really get on it, otherwise it's ok during normal driving. Tranny was rebuilt by Shep about 40,xxx miles ago.

One thing, last time I took the tranny off, the TOB was in pieces and destroyed my pressure plate.. possibly the same issue again? and possible crankwalk? How else does the TOB disintegrate like that? Clutch is a ACT 2100 and OEM factory TOB, fork, pivot ball.