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The oil pump is shot. I would stop running it under load till you get the oil pump replaced. The pumps were redesigned by CAT several times and the relief valves on the pump are weak in addition to changing from a gear pump to a trochoid (gerotor) pump and the idler gear bushings/bearings...

How many miles and how often do you drive it? What's your oil pressure and have you checked out the HEUI injection actuation pressure stability? What are you ultimately planning to do with the truck? For most of us, ECO hubs are a very good idea for drivetrain longevity.

Don't worry about simplifying till you address the early HEUI system, superceded engine oil pump, and cleaning/servicing every electrical connection and everything rubber on the entire truck. Beyond that - there are many threads on how to remove the LBCD, change over to a commercial alternator...