02 Ram 4x4 whining noise from front end

[Drfeno]

I have an 02 Ram 1500 4x4, and recently, there is a whining noise that seems to be coming from the left front. It goes proportional to speed, so I thought it was tire noise. The old tires were from 2006 (this is a 2nd vehicle). after new tires, the whining remains. Any ideas what it could be? CV joint/axle? wheel bearing? Is there something that normally fails on this model?