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THE OIL PUMP IS LOCATED INSIDE THE OILPAN ON THE BOTTOM OF THE ENGINE! YOU'LL HAVE TO DRAIN THE OIL, AND REMOVE THE OILPAN! ON SOME VEHICLES, YOU HAVE TO UNBOLT THE ENGINE MOUNTS, AND RAISE THE ENGINE ENOUGH TO REMOVE THE OIL PAN, SO YOU CAN GET INSIDE
Remove exhaust crossover pipe at manifold and converter.
Remove flywheel cover.
Disconnect transmission oil cooler lines at oil pan.
Remove engine mount 'through' bolts on V8. Loosen right bolt and remove left on V6.
Remove oil pan bolts and lower oil pan. Check that forward crankshaft
throw and/or counter balance weight are not extending downward so to
block oil pan removal. Turn crankshaft, necessary, to put throw on
You must raise then engine high enough to remove the oil pan. Loosen motor mount bolts & remove them, jack engine up enough to remove pan or use a chain block. Use wood blocks to support engine at motor mounts. Good luck!
Your timing cover is worn through. Your timing chain has worn down the guides and is now eating a hole in the timing cover. You will need to replace the timing set. If you are doing your own work, you will NOT have to remove or loosen the head. You will need to remove the oilpan. It's not so much for the clearance as it is cleaning out the trash in your pan. The guides are now in your oilpan, and if you don't take it off now, you will shortly after the oil pick-up screen is blocked with junk. I'm not sure about the 2 wheel drives, but on the 4's you can take the motor mounts loose and jack the engine up enough to get a piece of 2X4 between the mount faces. You can then wiggle the pan out. Since you are replacing the timing chain and have to remove the radiator, do it first. Otherwise you will jack the fan through the fan shroud. Have fun.
Before you remove the transmission and not knowing the condition of your oilpan, I might be able to save you some trouble.
If you have a few leaks in the metal of the oilpan, JB Weld can be used without replacing a pan. If you have a stripped drain hole, there are oversized plugs and rubber expansion plugs for that problem.
Sometimes you need to turn the crankshaft to clear the rods. And you can clear the frame and the oilpump with the oilpan by loosening the motor mounts and trans mounts and lifting the motor and reblocking the motor mounts.
But if you want to still pull the trans out, you will pull the driveshaft, the trans linkage and dipstick pipe. Then unbolt the starter, torque converter, and finally every bolt on the trans case to motor block. Earlier you loosened the trans mount bolts, now the frame crossbar should be unbolted and everything should drop.
You should be able to drop the pan by removing the bolts. On some vehicles it is necessary to jack the engine up after removing the bolts from the engine mounts. If this is necessary then once you have your engine up high enough (usually 3 to 4 inches) put small blocks of wood where the mount would go to support the engine while you remove the oil pan. Also you can work the oil pan gasket around the oil pickup tube with the pan down with out having to totally remove the pan from underneathe the truck. If you do this just make sure the gasket is not twisted before reinstalling the pan onto the engine.