Chevrolet silverado has whining sound in gear?

This problem was noticed on Chevy silverado with manual transmission.This is a floor shifter 4WD lever in it.

If you hear this noise from the transfer case and rear of the transmission area the first thing that needs to be done is make sure BOTH are full of fluid.Low fluid can cause this noise.

If the fluids are full then drain both and see if any metallic flakes or chunks come out of the fluid, if so which ever had the metal in it has an internal problem.If both fluids drain out pretty clean fill them back up with the correct lubes and drive and see if the noise went away.
If its still there run it up in the air and listen with a stethoscope to those areas and where ever you hear it loudest has some internal problems and would need to be replaced.Also just make sure the rear end gear is not the source of the noise when you are running it up in the air duplicating the noise.

This can also be possible.

Inspecting this possibilities will help you.

Thanks.

----------------

See below latest gear shift related solved problems :-------

Chrysler PT Cruiser only goes in First gear?

http://howtobyme.blogspot.com/2011/11/chrysler-pt-cruiser-only-goes-in-first.html

Car is stuck in park and the shift will not move?

http://howtobyme.blogspot.com/2011/08/car-is-stuck-in-park-and-shift-will-not.html

Car will not come out of Park?

http://howtobyme.blogspot.com/2011/11/car-will-not-come-out-of-park.html

Automatic transmission will not go into high gear?

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

Car won’t downshift sometimes?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-downshift-sometimes.html

Buick Park Avenue:Transmission will shift into drive?

http://schematicsdiagram.blogspot.com/2011/12/buick-park-avenuetransmission-will.html

Ford Taurus won’t shift from park?

http://schematicsdiagram.blogspot.com/2011/12/ford-taurus-wont-shift-from-park.html

Car Transmission will not go into Park mode?

http://schematicsdiagram.blogspot.com/2011/12/car-transmission-will-no-go-into-park.html

Shift indicator directly goes to 2nd when key is turned ON?

http://schematicsdiagram.blogspot.com/2011/12/shift-indicator-directly-goes-to-2nd.html

Third gear missing and engine losing power?

http://schematicsdiagram.blogspot.com/2012/01/third-gear-missing-and-engine-losing.html