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I have a 2006 Ascender 4wd. 6 Cylinder. I hear a whine in the transmission when in neutral the car shifts fine . Any Ideas? Thank you
 

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If this is really in the transmission... in neutral, you're hearing your front pump blades.

It COULD be a broken pump ring... that would be a short trip though... aluminum being shredded and being pumped through the unit.... bad news!

It COULD be a partially plugged or badly installed filter..... or broken/missing seal on end of filter pickup tube

It COULD be low on fluid......

The pump might be in full flow-pressure position, being told to go there because of a modified ECM.

If you don't want to drop the pan to check the filter situation and for debris, at least run a line pressure test.
 
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