Humming in turns. Check the tires for cupping on the outside of the tread. That will cause a humm in the turns at speed.
On the other hand, if the bearings were replaced and the correct preload wasn't put on the axle nut then it could be the bearings again. A definite problem if the same axle nuts were reused since the stock Ford nuts cannot be reused. They will tighten up on the axle and even to the correct torque but the binding will not allow them to apply adequate pressure on the hub and bearing assembly.
Former owner of '99 CSVT - Silver #222/2760
356/334 wHP/TQ at 10psi on pump gas!
See My Mods
'05 Volvo S40 Turbo 5 AWD with 6spd, Passion Red
'06 Mazda5 Touring, 5spd,MTX, Black