every other 4.0 I've had hovered between 35-40 PSI cruising down the highway, and all of those have double or triple the miles this one has. I guess as long as it's not making ugly noises I'll run it. I need to have a good spare shortblock on hand anyway since I've got two daily driver 4.0s.Generally, 1psi per 100 rpm is considered safe. So your number don't suggest a need to do anything. If you're pulling the pan anyway for RMS, then might just throw a new pump in, but I doubt I'd bother pulling caps.
that one was a longbed, so it doesn't seem to matter, that's where it needs to be.Cool that's where I set it