Whine

If you set the freeplay right, the TOB shouldnt be spinning. At least mine doesnt. And a dry TOB wont howl for long.After a bit it makes other noises.
The pilot bushing is oilite. It will make noises if it seizes on the input shaft. Doesnt happen often. They also make a noise with excessive clearance. I wouldnt call it a whine though.
Reverse gear often make a whining noise.But the noise stays as long as the vehicle is moving
-Take the tranny down, replace them both, problem solved.