12evo12

hi today i was driving my evo 8 back home and i noticed a light gridding sound between 2000 and 5000 rpm im geuss thrust or gearbox bearing any one else have any idears ? i also makes the sound now just on tick over but goes away if engage the clutch also iv noticed its some times hard/stiff to slector 1st and reverse when cold any help would be great thanks
dan