Weird noise when stpped

[steveoelo]

I suspect either transmission or clutch trouble but when the truck is in neutral, I can hear a howling/ humming noise. When I push the clutch in it goes away, ideas? I suspect worn throw out bearing but advice is always good. 5 speed Mitsubishi trans

 

[4x4junkie]

Bad input shaft or countershaft bearing inside the trans (input bearing issues are fairly common on the Mitsubishi transmissions).