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sounds like the wheels are out of balance, is there a slight vibration through the steering wheel at this speed? and does the problem stop if you go faster (please drive carefully)
Possibly a wheel bearing issue, does it `get progressively worse as speed increases or better as it decreases? does it stop when applying the brakes or get worse?
MOST of the hums after a while come from the diff as the back axle does the driving and almost all its life runs the same way except when going in reverse ,is the rear diff meshing and worn on both the crownwheel and the pinion and the humming gets slightly louder the faster you go and almost goes when almost stopped and this can also be the slight vibration you get so get the diff oil drained and refilled and check if there is any metal in the oil when drained if so thats your problem But it will last for years like that..Let me know how you get on RON
Chevrolet has a common problem with integral hub and wheel bearings wearing due to exessive use or lack of lubrication, the balls or rollers and races become pitted ,scored or just plain damaged which will infact cause a loud humming or growling noise. I have had some humm at about the same speed but usually they will start to make noise at any speed. I would have to hear the noise to be sure cause there are many things to cause a humming noise like odd tire wear, bad idler pully bearings, e.t.c. the tires should be lifted checked for excessive play in the bearing. Take tire off depress brake piston in just enough secure brake rotor use stethoscope spin hub while listening. maybe he replaced wrong side seen that alot, seen tire noise mistaken for bad bearing to if struts or shocks are worn can cause tires to be choppy. I would recommend taken back 300 dollars is alot of money to not fix your problem.
when some vheel missing weight , the vibration begins at 40-45 mph, now if begins at any moment of acceleration ,check inner drive shafts , no outer joints
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.
Sounds like front differential or front drive axle issues. Check the front differential gear oil then take er' to the dealership before you end up spending a bunch of $. Most people change their oil frequently in the engine but forget about flushing the transmission fluid and changing oil in the front and rear differentials. I have three Ford 4X4s. Two which really get used hard. The 93 has 311K miles and still runs excellent. Trans and differentials get a fluid change every 25K miles and moble one synthetic engine oil changes every 5k miles.
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