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lifters are good for that, look at the age of the truck, old... and if youve never changed them, they are original, if you use conventional oil, its thick, so after a while they tend to stick, lucas helps, if you really want it to stop, havta change it.
another thing to keep in mind that regular oil pressure on the 4.0 is around the "m" of normal, not sure how many pounds that is but that is at running temp and about 800 rpm. Hydraulic lifters need the pressure to their job. the "N" of the normal of the gauge should still be enough to prime the lifters so yeah Lucas should help. i wouldn't tear into a motor with that low of pressure though unless you asre looking to do a bottom end as well.