6 speed transmission Whine

[JField]

Going up a grade in 6th, there is a pronounced whine at about 65-70 MPH.

Very narrow window of speed where whine occurs. See signature below:

















2007 3500 MegaCab 4x4 6 speed Laramie, 5. 9 White w/Khaki, all options except sunroof.

 

[klenger]

Might be normal, or maybe the transmission is underfilled, starving the front bearings when climbing.