My 2015 F-150 has recently developed general front wheel rattle which suggests the 4WDs are not working properly. After a little research, I found that this inexpensive valve could be the solution. It's very easy to install, just pull the hoses out of the old valve and replace it. You may have to do a little work to get the old one off or this one, but it's not difficult. He fixed the problem immediately and I no longer had the problem.
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