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LOL. Mine were loose on the shaft between the tranny and xfer case. Two good 3/4" wrenches tightened them. I am due to check them again.

Are your ujoint bolts loose? Common problem. A 400 mile trip could do it.

I did not hear a knock. Maybe you have one when things get warm. But for sure there seems to be a roughness, so your hunch (and other's advice) regarding fuel seems a good thing to check. I have a question about cracking an injector line to isolate a knock. Let's say #6 rod is knocking for...

Obviously the filter adapters caused a loose bolt or nut to appear in the bellhousing and bounce around as the motor was running. Did you do anything else to the motor when you changed the oil? I still have a hard time believing that an O&F change caused a knock.

Why would changing the oil cause a rod to knock? Could there be a problem with the filter kit, not flowing enough oil? I would probably reinstall the old filters, removing the kit, and start it up to see if the noise changes. It won't hurt the motor any more to run it for a few more minutes.