Clacking you say? There's a couple different things it can be, as mentioned above, it's most likely a component driven by the belt. Clacking leads me to believe it's the harmonic balancer. Check the tension pulley, is it moving at all while the engine is running? if not, great, it's probably something else. If it's moving back and forth like a jackhammer, it's likely the harmonic balancer unless one of the other pulleys is visibly warped and causing it. If that's not it there's a few different ways to tell which part it is, I recommend shutting the engine off and checking each component for play at the pulley, if I were going by other posts on the site, I'd check the a/c compressor first, then the power steering pump, with the water pump and harmonic balancer being last. Somebody else here likely knows a bit more about the construction of the harmonic balancers on these trucks, but if it's anything like the one on my 08 Dodge Caliber, should be a big steel pulley in 2 parts connected by a rubber or silicone ring. That ring tends to Crack and break when they fail, so check that the ring is in good shape, and the outer piece hasn't started walking away from the inner piece.
Once you've found the culprit, for any component except the harmonic balancer, you can confirm by spraying lubricant directly at the bearing to the component, the noise should stop momentarily and return a moment or two later. Take it easy with the spray, if you get enough on the belt, it'll slip over the failing component and misdiagnose the problem, that's why I recommend doing it last for confirmation.
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