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7.3 longevity
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  1. 99-03 7.3L General Discussion
    I have a 99 4x4 dually I purchased with 157xxx miles on it about 6 weeks ago: Maintenance/Mods done since: changed every fluid (Except brake fluid) and filter installed a John woods valve body, TruCool trans cooler, derale trans pan and Dieselsite external trans filter sinister diesel coolant...
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