loud noise when i put first or reverse, transmission problem.

[trowa]

I have a strange noise when put first, reverse or lower gear.
all started after changing the clutch (ac competition clutch) and flywheel.
at first sounded just being cold engine.
At the moment the engine sounds so cold or hot.
change bearings clutch but still the same.
it may be that the box has a problem with a bearing not know.

apologies for the English, I speak Spanish natively.

from already thank you very much.