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I doubt it's the pump. The only reason I have ever replaced pumps are on engine rebuilds or someone wanted a high pressure pump. Since you have good pressure, then no pressure until the RPM's are up. I would say the crank bearings are a bit worn. Going to zero pressure means something is not getting enough oil. Just a note... If there is a lot of sludge, some port could be clogged. But this also leads to a total engine rebuild, not just the crank and bearings.
Knocking in engine and low oil pressure usually means bad main bearings. May have been caused by bad oil pump or just worn out bearings due to high mileage. If this is problem needs engine or rebuild old engine.
lack of service probably the cause try thicker oil or stp engine wear oil has it been stood for a while? if so recomend new oil and filter make sre you flush old oil out with cheap oil then proceed with oil change you can use oil flush too the oil should be golden once started after a week check oil again for signs of emulsification on the cap
Before you start to pull the crank out, check your oil pressure via an independent gage. Then if you have around 25-30 psi gage, drain some oil out. Put a quart of Marvel Mystery Oil in and top off . Change oil filter. Drive the truck for a few miles. Change the oil and filter. This should start to break away the sludge that is built up.
You may need to do this up to 10 times before you can go 3000 miles on an oil change.
Now if the oil pressure is extremely low, yes you can change the crank in chassis. I have done it in a pinch before. It is much easier to pull the engine and put a crank in. If the crank is bad, you also have a rod that is bad. You also need to clean all the parts or emminent failure will occur.
I would also change the knock sensors on your truck as well. Hope this helps. Rate me high.
First have your oil level checked and make sure that it is at the right level. If not that's your problem, if your level is good you may have a bad oil pressure switch. This can be checked by using a oil pressure guage. If switch is bad replace and solve the problem. However if your vehicle has alot of wear and tear on he engine and you were using 20w-50 oil and it was replaced with 5w-30 that oil may be too "light" for the vehicle and you would get a low oil pressure reading. Good Luck