You know how kids put cards on the spokes of their bike tires with a clothes pin? You know that sound it makes, Well, when I'm driving my truck and I take my foot off the accelerator, and like coast I hear that sound... What in the world could that be? I have a 1999 Ford Explorer, with 140k miles.
Could be a wheel bearing(s) going out, could be universal joint(s) in the drive shaft going out, could be a brake pad/shoe(s) dragging on a warped brake rotor/drum, or it could be a bent dust cover rubbing inside the wheels, or it could be part of the plastic in the fender wells come loose and it's bouncing on the tires, or it could just be the cooling fan rubbing on radiator fan shroud/housing....could be lots of things.
Can you tell what direction the noise is coming from? Front or back, left or right? Maybe a U-joint or check for metal in the rear differential
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