SOURCE: Rubbing or grinding noise coming from Driver side rear tire/wheel
I had the same problem that based on interner research is common for Fords trcuks/suvs. The common problem fro rear humming "rubbing"sound might be the rear wheel bearings/seal. These will need to be replaced as it will progressivly get worse and the noise louder and eventually the bearings can sieze. I would hesitate to take to a ford dealer if I were you as it can run $500-900. Take to mechanic that knows how to replace wheel bearings and seals. My mechanic replaced them for about $150. and the bearing and seals are around $40. A good way to test this is to raise the wheel were you can freely spin by hand...if does not spin or there is a lot of friction then it might be the wheel bearings.
Good Luck
SOURCE: My 2004 F-150 2WD is making a clanking noise on front left tire
The sway bar linkage probably came undone on one of the sides. Wikipedia has a picture of what your sway bar linkage may look like:
http://en.wikipedia.org/wiki/Sway_bar
That is a picture of a Porsche sway bar, but the idea is the same. Make sure all bolts are tight and that one end is not missing the linkage that connects it to the spring/strut. The grinding of the brakes may be the sound of the linkage piece touching the rotor. Sway bar is a logical solution to both issues.
If that doesn't fix the issue, put the front end of the truck on blocks or jack stands and have somebody wiggle the tire up/down and side to side while you inspect the mechanical components underneath. Other things to check may be the ball joints, tie rod ends and suspension bits.
SOURCE: Terrible vibration - 2004 Ford F-150 5.4L
It sounds like when ford rebuilt your rearend they didn't set the gear lash correctly. What is happening is that when your truck cools down the gears are contracting and they are not aligning properly because they did not set the lash right when they installed your ring and pinion gear. When the gears heat up they may be freeing up. Ultimately this will end up chewing your new rear end to pieces. It is only a matter of time. It could also be the pinion bearing, if the tech put your pinion bearing on with an impact wrench it will fail in a short time. It needs to be put on by hand with a torque wrench. Some ideas to look into, it may not be whats going on, but it sure sounds like it.
SOURCE: I have a 2003 eddie bauer ford expedition, when im
A vacuum leak. Look & listen for hissing noise where rubber or nylon lines come through firewall under dash near brake pedal. Also look under hood at large hose going to back of brake master cylinder, power brake booster.
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