Actually, there are a few substantial differences between those two calibrations.
Most notably, the 1-2 shift speed, 2nd gear TCC apply, and fuel rate/ICP.
The 25T will run similar to a stock truck with a slight increase in power and efficiency and will be slightly quieter than the 40T.
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Tuning, PCM flashing, and burning chips for 7.3s since 2008. Repairing all aspects of 7.3L Powerstrokes for 25 years.
Eight 7.3L PSDs in the driveway including a 1994 Crown Vic and 1973 F100/2002 F350. Looking for the next victim.
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