whinging noise

[chevymaher]

Same carrier I got in my van. They are a noisey critter. But a good posi.
No it wouldn't whine all the time. It is actually the sound of the gears meshing. That carrier is hardened steel so it carries the vibration/sound better. No sound deadening qualities to that one.
On jackstands in neutral spin the wheels and driveshaft. If it isn't growling then your all good. Just gear noise.