Low level hum and vibration occurs at about 50 mph and up. It almost sounds and feels like an interrrupted tread tire but the truck has highway treads. When I veer to the left, the hum increases and when I veer right it diminshes slightly. Also sounds like gear hum. Truck is 4x4, has 55k, new brakes. Tires have been rotated and balanced with no change.
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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If you're running high mileage tires or let one run low, real low on pressure a tire may be damaged. Put on a glove to protect your hand. Run your out stretched hand over surface of tire sides and tread, any bumps are suspect. Wire protrusion means stop and put on the spare.
It sounds like a bad tire, possibly a broken belt. Check the sidewalls and tread of all the tires for bulges. If good it probably is a bad wheel bearing. Try to isolate from where and what side. If the noise gets louder turning one direction but not the other, then more likely a bearing. If it stays constant both directions but gets louder with speed, then suspect a tire.
Usually a vibration is due to one or more parts that have become worn or damaged. I'm not sure why you mentioned the tires but don't disregard them unless you know that they are fine. Check for correct inflation (on the door jam), for uneven tread wear, or bubbles and damage. Other things that can cause a vibration is the front-end needing an alignment, a tire that is unbalanced, worn out steering components (like a wheel-bearing), defective u-joints and/or an unbalanced drive-shaft, or low gear-oil level in the drive-axle can cause damage to the ring & pinion gear. The damage would primarily be on one side. So when you let off the gas pedal the sound goes away. Check as much as you can and let me know how it is going.
Alignment will not create a sound by it's self. The most common cause of humming (especially if you have an agressive tread design)is a wear pattern in the tires...check for that or rotate the tires around & see if the noise changes. If it does then you know it's in the tires. & Not always, but most of the time a bearing noise will increase or decrease in intensity if you load up one side at a time by doing 35-50 mph & turning slightly to each side.
Tires would be the 1st place to check. If you seem to feel it more in your legs then it is likely the front, if felt more in seat bottom then could be a rear tire. Depending on how severe the vibration is there could be a tire developing a tread seperation and should be checked right away. A simple balance of the tire and wheel assemblies may be all that required also but when on a balancer they should be able to tell if the tire has a more severe problem.
Driveline components could cause vibrations also however if the above sounds like it fits then check that 1st.