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Welcome to the site from California, Red!As long as you have a pre-1986 gas engine in your truck it has a two-piece rear seal that can be serviced by dropping the oil pan. However, oil leaks from the oil filter, valve cover gaskets, rear intake valley seal, the rear cam plug, rear oil galley plugs, or oil pressure switch can mislead diagnosis by dripping from the same spots as a leaking rear main or oil pan, especially if there is a lot of oil accumulation. Clean the area well and look carefully before you tear it apart. How many miles on your engine?
I'd go to a nearby car wash--the self serve kind that has power washer hoses. Run your truck at idle and pop the hood and start spraying. I do this with engine running because if i hit a delicate spot, the idle will decrease and I quickly refrain from putting too much water in that area. But, especially underneath it, i'd spray the heck out of the engine with the high pressure water. Once clean take a small point and shoot digital camera to take pics of areas that you cant put your head, just your hand and camera and take a billion pics to diagnose where the leaks are. If your camera has a flower setting on it (usually the sympol for macro lens) use it so the close up shots are in focus.