2004 Dodge Dakota increasing loud whining noise begining at

Noises problem
2004 Dodge Dakota 6 cyl Two Wheel Drive Automatic

my 2004 dodge dakota quad cab v6 has started making a oud whining noise whie moving, begining at 20 mph and increasing with speed. I checked the power steering fluid and transmission fluid and both are good. It does not make noise unless vehicle is rolling. Noticed that noise stops for a moment when going through a left curve or when going through a dip in the road. Could it be the rear end needing lube or drive shaft. I have no idea. Please help. Thank you