I thought about that too, because the clunky one seems a bit odd. But I just wanted to check with the group and make sure that it wasn't like a fan clutch, which in that case spinning freely is a sign of a worn out fan clutch.
Kind of wonder why opening up the pumps was not the first suggestion... BTW EVERY oil pump from ANY idi fits all 6.9 and 7.3 idi engines. And the oem pumps are better than the Melling.
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