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If you pull the head, then the oil pan is not necessary, although I'd do it anyways considering the seal at the bottom as well as coolant possibly dripping into the pan. So a nice good clean is good to have
Oh and if your timing chain guides were already broken, then the oil pan is a must because then you have to dig them out of the oil pan. You don't want to leave them in there. LOL!
And correct on the idler arm on passenger side with 3 bolts to drop the drag link. That and the sway bars had to be disconnected along with the cross member that goes straight across under the oil pan.
Finding and correcting the root cause of a failure is the difference between a parts changer and a technician.
Too many trucks I've been through so not going to list them all. But they have all been good to me and I'll keep buying old ones.