noise coming from my transmittion

[quick6black]

something is squeaking really loud and when i put my car on a lift and turn the drive shaft it appears that the squeaking is coming from inside the transmittion. my mechanic said that it was my u joints so i had them replaced and the squeaking noise is still there. my tranny fluid levels are fine, i changed them over the summer along with the filter and gasket. the fluid is not burnt and the tranny shifts perfect, i just don;t understand what is squeaking, is there any bearings inside the transmittion that could go bad, any ideas?

 

[MeanBuicks]

There are plenty of bearings, washers and gears that can fail and make noise. Do you hear the noise in all gears? While you are stopped and/or moving?

 

[quick6black]

just while moving, when i step on the brakes the noise stops for a few seconds, does this mean that i need a tranny rebuild?