TKO 600 noise

[maxum_101]

hi all,

i have a tko 600 mated to a 392 ford crate engine and i think a centerforce clutch, i say think cause i can see orange thru the fork opening. now i have a slight chatter sound that is present while the car idels and gets louder as you rev up the engine a bit, and when i put in the clutch the noise goes away, i have never changed the oil in the box , approx 800 miles on tranny and motor, im thinking its the clutch but not sure if its the tranny and how the gears are ,,, are the gears always turning in the box even when in neutral?
i have read here that the fluid in these tranny are not really good that gm dexron or something like that is better to use. has a hyd clutch.

anyone one else have this issue? would it be the clutch or the tranny making this noise?

also i havnt checked oil level in the tranny yet, could that cause the noise if the oil level was low?

not sure if this makes a diffrence but the car is a superformance.

thanks for any input on this