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Re: Hum in the front end of Z71 4X4 at 30 mph and above....
Have the drive shaft checked out. You may have a bad hub bearing or bad CV joint. Look for cracks in the boot, and grease that has been flung inside wheel well
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Blister or broken steel braid in tire. Lug nut torqued properly? If you suspect tire, move it to the back and see if the noise/vibration migrates with it. The only other guess would be your wheel bearing is failing.
The dealer is not going to replace something if they can not prove to the company the part is defective. The company won't pay the warranty claim. A bent axle was my next guess. A garage could find out by using the same dial indicator used to check for a bent rim. The dial gauge is placed against the shaft and the wheel is turned, if the axle is bent the dial will move. I don't know what Road Forced balanced means, but most balancing machines duplicate road speed of about 30MPH. So a tire or wheel can balance ok on a machine but still have a vibration at speeds above 30 or 40mph. The easiest way to make sure is move the front tires to the back and see if the vibration travels too. If you are describing the problem correctly, it almost has to be in the transmission, the axles, or the wheels. There is a slight chance a strut or strut mount could be faulty and allowing a small bounce to be amplified.
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.
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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