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a lot of stuff to fix here
oil: with the truck running hot, I would use a heavy oil, like 10-40
trans: where is the leak? If pan, tighten bolts. seals are much harder repair
water leak: possibly a freeze plug. Maybe you should pull the tranny and fix the water leak and the trans seal at the same time (if the seal is bad)
overheating: maybe just caused by the leak. Hard to tell until the leak is fixed. Might want to check the radiator for sludge and back flush if dirty.
hard sound: probably loose flange seal at exhaust manifold. check hole exhaust pipe to locate leak. If not along pipe, unbolt the flange and put in a new gasket.
engine problems: is the engine light on? If yes, have the truck scanned for trouble code and report them back to us. Autozone does free scans.
More questions, please let us know
What are trying to do, change the belt or just set the timing? The timing marks should be on the left side (drivers side) near the front pulley. There is a notch or line on the pulley and the scale is on the timing cover. If you are trying to change the timing belt, you have to remove the fan and water pump pulley, then crank pulley and the timing cover. If you are changing the belt, here's a helpfull hint loosen the tensioner bolts, one 13mm one 17mm, then pull or push on the belt to force the ternsioner back as far as you can and tighten the 13mm bolt. Now you can take the old belt off and put the new belt on with ease. You have to set the crank at zero, I think the key in the crankshaft is straight up at this point, there is a diamond shaped mark on one of the teeth of the pulley, that lug has to line up with the notch in plastic behind the pulley. At this point you want the arrow on the cam pulley to point to the mark on the inner cover (about 6 o'clock) and the rotor in the distributor should point to the "V" notch in the pick up coil assembly (about 6 o'clock). Good luck!
The pins / wedges just tap out use a scewdriver on the metal edge of the pin just tap it out to the rear and when putting them back in just tap them back in from the front. You will see they are diamond shape and metal cased around rubber very easy to do just take your time.
Put the harmonic damper back on with the timing pointer mounted. Rotate engine until #1 is at TDC with both intake and exhaust valves closed. Timing pointer should be very close to 0 degrees. You should find a mark on the crank gear pointing straight up toward the cam gear. Rub the gear with a rag and acetone or alcohol to remove any varnish/oil buildup. When you find the marks on the crank gear, cam gear and auxiliary shaft gear, clean them and paint them with day glo orange so you can really see them next time. I'm assuming you have the 2.3L 4 cyl. engine since you said "timing belt".
depends on what size engine it has the 2.3 or 2.0 the cranshaftmark will be on the timing cover the camshaft will be the pointer below the gear. the gears will have a dot or arrow on them just align them before you put the new belt on.