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Does it make a noise when in 4x4 only? Does it make the noise in 2WD as well? A humming noise is usually associated with a wheel bearing noise. If while driving you steer from side to side and the noise changes pitch or becomes less/more severe it is most likely a wheel bearing. You can raise the vehicle and safely support it. Grab top and bottom of the wheel and feel for play.
The hum could be being generated by the tires. I would move the rear tires to the front (as they are a different brand) and see if the hum is exactly the same at the same speed.
High speed hum can also be generated from the design of some types of brake rotors but I doubt that is the issue in this case.
From what you have described I would not have thought the problem would be wheel bearings so I am surprised that was the diagnosis before a more careful investigation was carried out. I would have tested the tires first. (I would not have put the old wheel bearings back in either after they had been changed).
Does the humming noise reduce or change in pitch slightly when turning a corner? Most likely a wheel bearing failure. Also, when one wheel bearing on one side fails, the other is not often far behind. I often therefore replace in pairs.
It's most likely the left wheel bearing that's causing the noise, when turning to the right the weight of the car shifts to the left placing more load on the left wheel bearing and takes load off the right bearing.
ok it could be two things. it could be rear wheel bearings or a rear diff. If its a high pitch wine then its worn gears in your differential. its needs serviced or replaced. If it more of a rumbling or grinding hum, coming only from one side or both) then there are bad wheel bearings.
It needs a wheel bearing. You should notice that the pitch of the noise changes as you change the speed of the car. Also the noise is changes when you brake and/or turn, it may even disappear all together.
See If the pitch changes when you swerve the car from left to right. You don'e have to swerve hard enough to scareanyone, just enough to load one side more than another. If the pitch changes, you likly have a bad wheel bearing or tire. Tires will make any noise a wheel bearing will so switch tires first side to side and see if the problem fgollows the tires. If not then check the wheel bearing.
Also and maybe first:
The fact that the noise is limited to such a narrow speed could also indicate an aerodynamic issue such as a roof rack or bike rack or somthing like that having moved and is now vibrating.