With 108K and you suspect original plugs and transmission oil I'd change both - its due. I believe the 1999 5.4 has the coil on plug set up - old worn out plugs make the COPs work harder and burns them out faster too - and they are expensive to replace. As mentioned by another you can drain the converter on those transmissions without too much extra work - pull the black plastic plug and rotate the engine until you see the drain plug. Read up on changing the spark plugs - its real easy to strip the threads on those aluminum heads and you want to use copper plugs as replacements - platinum plugs for some reason just don't do well in the Triton engines.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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