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 - The River Tractor - by Charlie English Jr.. This is a 4010 John Deere that was used to farm on the Diamond Island which is in the Ohio River about 15 miles southwest of Evansville, Indiana. About ten years ago, this tractor was parked close to the bank as the river was washing the bank of the island away.
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