iv been searching and trying to find an answer.
i found several threads in several different places about oil pressure at idle or while driving.

right now i have about 40 when cold or warmed up and driving. about 13 at idle when warmed up.
normal right? (from what i read)

when i stop and put it in 4wd(high) oil pressure gets way low like 4-8psi
that..cant be normal. why does it do that? extra strain? how can i fix this?
i think my winter plan is replace. oil pump,pan,filter. clean pickup. new rear main. might be leaking idk. oil is everywhere. but no leaks on the ground.
oil level is perfect and stays perfect until 3k miles for change of oil