Doesn't sound like a throw out bearing, but never say never. I suggest getting a high quality throw out to have on hand too. If you replace the disc, you'll need to get the flywheel re-surfaced, or you could get chatter from a new disc and used surface....sequences... 
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Mitch
1970 Chevelle SS
1966 Chevelle SS
1967 Camaro ss/rs
1938 Business coupe, street rod
2000 FXSTS, original owner, 13k miles
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