Import Shaft Bearing Noise

[uzawtun]

Hi,
My corolla seca 1998 has noise inside from gearbox. When I press the clutch pedal the noise gone and when I depress the clutch pedal I can hear it also while driving as well. So is there any way to overcome that problem? What about if I replace with thicker or thin oil possibly can overcome that?
Zaw

 

[Scott O'Kashan]

Mechanical wear and tear can't be made up for with a thinner or thicker gear lube. The transmission has something wearing out and it needs to be repaired. No way around it.