04 Trailblazer 2x4 noise while driving, only when going left on Freeway/not on street
 

This thing is pissing me off, I already changed the right front hub and it's still doing the same thing. It's basically doing it worse when on the freeway and there's a curve going left or if I drive straight at 25 mph and lightly pull the steering wheel toward the left and then straighten it again right away. Almost sounds like a flat tire sound, not so much grinding, dull noise. So if it's not the front right bearing, can it be the rear? Could also be the differential bearing/s right? I hope there isn't anything rubbing when on left movements, but unlikely. So I need some opinions here, thanks in advance for any help.

Jack up the front end, remove the wheel and brakes. You shouldn't have to remove the rotor, just the pads. Spin the hub. If it makes noise, that's probably what it is. While you're under there, use a pry bar and see if you can move any of the balls joints or control arm bushings. Do both sides.