Re: Oil pressure issues
Older 4.7 have small oil drain back holes that plug with sludge. I don't know if they fixed this with 4.7 in wk. I said before, my brother blew his head gasket likely due to a sludge blockage in an '02 HO overland and my father in law blew his for the same reason in an '01 Durango. Both engines had over 100k on them. I know the oil change schedule on both were not steller either. If your head gasket is still good you may want to try some autorx to try and clean the drain back if they are clogged. It is a slow process that is gentle. Or you could shock treat it with seafoam or another caustic type oil treatment.
The only way to know for sure is removing a valve cover and check to see if you are sludged up. A little manual cleaning could also free the drain backs.
2006 Limited 5.7, SRT8 Manifolds, 3'' custom walker quietflow system, Crazy Jay Cam, Inertia Performance Heads, Airaid intake tube w/ KN drop in filter, srt8 pushrods, bilsteins, diablo