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Diagnosing terrible grinding noises coming from the F150 front end. The 4x4 front hubs were locking and unlocking while driving down the road. It sounded like a brake issue or a loose heat shield. This is a common issue on 2004+ F150s with integrated wheel ends (IWE). There's a TSB from Ford for this here:
static.nhtsa.gov/odi/tsbs/202...
Check valve here:
www.amazon.com/gp/product/B00...