I'm getting this hollow grind noise only at 40MPH. Nothing under 40 and it goes away right around 41-42MPH. Not sure when the sound started but its been more apparent since I fixed my bearing issue. Could my tires not be balanced correctly? All 4 brake shields are fine and not rubbing, nothing stuck in them either.

I have a blown strut that i'm taking care of soon (Coilovers ) but that's the known issue with the car