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Wow....it's really sick then. The air filter is good for a LOT of miles. It will hold about 3 pounds of dirt before it requires service. You didn't mention anything about the auxillary transmission filter (right front corner of the truck underneath). Is it rough on start up or all the time and have you had it code scanned???
You're better off to get your filters at dieselfiltersonline.com The NAPA filters are NOT something you want to use on your truck. PERIOD. Motorcraft/Racor/Navistar filters are the BEST. The airfilter is made by Donaldson, who makes the BEST forced induction filters in the world. You need the blue synthetic media air filter.
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