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I talked to a guy at Flying J, named Ron does hot shots for an oil company out of Rosenburg,TX. He put 672,000 on a 97 F250 PSD with auto. He changed engine last year with a 97 PSD from a van with 91,000 miles and has put 150,000 in one year on the "new engine". As far as the rearend never changed fluid. Transmission is the same, only thing changed was water pump. See what good maintenance does for you!!!!
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99 F250 PSD CC 2WD 212,000 miles