Try giving it a few hundred miles. It might need to break in. If it doesn't go away, something is wrong. I just installed a centerforce dual friction clutch on my car and it never chattered. It chattered when the old clutch was wore out, but after changing it, it went away. Is your rear main seal dry?
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92 GT, 4:10 gears, centerforce clutch, 6# powerdyne blower, bbk h-pipe, flowmasters
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