Question about 2006 Ford F-150
Sounds like you have a IWE that the gears are ground down, or a bad vacuum line to that side.
This could have been caused by the IWE ( Integrated Wheel End ) solenoid ) TSB :
You can check the vacuum line with a vacuum pump and gauge tester, just to be sure, but considering it is grinding while in 4WD, I would say the IWE needs to be replaced on that side. Maybe change the IWE solenoid while you are doing the work ( it will be a rounding error on the total cost )
Posted on Feb 03, 2010
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Posted on Jan 02, 2017
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When checking to make sure noise is wheel bearings while driving vehicle at speed the noise is loudest (if possible) turn steering wheel back and forth enough to shift the weight of the vehicle from side to side and if it's a wheel bearing there should be quite a bit of difference in the noise.
If about the same noise check the wear pattern on the tires for flat spots or unusual wear pattern if there is rotate tires. If nothing still found jack up vehicle with all 4 tires of the ground. Use jack stands for this. Get some one in vehicle to run it at speed the noise develops, I use a long screw driver (2 feet long) as a stethoscope to find where noises come from. Try with and without 4 wheel drive if possible. Good luck cause noises can be a real pain in the b____.
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