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No such thing on a SD. Ford uses coil on plug(COP) on all trucks after '99.
dualwheels66 is right each spark plug has its own coil on top.
Their is a rubber boot between each coil and plug that you should change, but before going to buy them pull the coils and give them a good looking over. I bought the boots a few months ago for my truck, waiting for the weather to get better before replacing them. Well last Monday I finally got around to changing them but when I pulled the coils I found 6 out of 10 coils had hairline cracks in them. I just ended up buying 8 new coils, 2 of the ten was relpaced 1 1/2years ago, so I replaced the rest.
Now truck runs so smooth and seems more powerful. I also while waiting for my coils to come in I cleaned my throttle body, IAC valve, and MAF sensor.
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