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Noises are very hard to diagnose without actually hearing them.
Overheating an engine can do damage to lots of different parts
What kind of oil pressure problems are you having? Have you checked the oil pressure with a real mechanical gauge? That should probably be your first step in checking it. And you might want to take the truck by a good mechanic and have him listen to it.
I've seen 4.2L engines leak coolant into the oil pan from the front cover and also have seen ones that had the front cover replaced but they didnt change the oil after they were done. Or they had been leaking coolant into the oil for some time. Antifreeze destroys bearings.
I've also seen people use a whole bunch of silicone on the front cover gasket and plug the oil holes. Not good.