Any changes to the truck such as differential gear ratio or tires size? Might be enough of a change. WOT/WOT 4x4 shift rpms changed? Just some thoughts, I'm not on my computer with Minotaur or I might of had a few other ideas.
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Thomas H.
'97 F-250 CCSB 7.3L Auto, Gauges, Modded H2E, 285/200% sticks, 7.3L IC, Stealth Dual HPOP, Pheonix chip
'03 F-250 CCSB 6.0L Auto, Gryphon CTS, FICM tuning by PHP, Powermax
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