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 - Seeing an Old Friend - by Joe Evans. Dad had a concrete contracting business starting in 1960. One of his first pieces of equipment was a Ferguson TO-35 with a Davis loader. Dad replaced the TO-35 with a MF 202 Workbull, essentially an industrialized Ferguson 35 I am told. Dad bought the 202 new in 1962, and I recall quite clearly going to the dealer with him to sign for it.
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