Have an oil analysis done on your next change to see how things look. Depending on how you use the truck you may not have to shorten it up as much as you think. Also, I know there is an hour meter on that truck so you can calculate your truck's average speed by dividing miles by the hours. If you can, post what you come up with.
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2004 F-350 XLT 6.0 Diesel 4X4 04/04 Build
PHP FICM & Rolled Back ECM/TCM 
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