tko 500 problem

ok.. i just put a spec stage 2 clutch and alum flywheel in my car also a tko 500
its been about 3k on the tranny
and now when i go through the gears everything is ok but when i try to downshift from 5th into 3rd (with the clutch pressed all the way down) it grinds...
it just started doing it recently
and my clutch cable is the factory self adjusting and i picked up on the pedal to adjust it... what could the problem be?
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