Transmission whines, Manual 5 speed, 158k miles.

What is your question?

Whine occurs whether transmission is in neutral or in gear. Whine follows RPMS There are no visible signs of a leak except the driveshaft spline still has residue on it. Is it possible that the transmission is only leaking when the vehicle is in motion? Transmission fluid levels appear to be correct when checked, but was checked before whining started. Whining started after replacing u joints.

What makes this problem better or worse?

Whine gets louder as RPMS increase

How long has your 2006 Chevrolet Colorado had this problem?

a day or two