Ford's tuning, albeit a bit weak, was also designed to fit into certain EPA emission standards. Also, the engineers who tuned the PCM didn't have the benefit of true 3D mapping capabilities so there are a few "rough edges" to smooth out.
Regardless of who "tunes" the truck, there is always going to be more stress in the drive train. There are trucks running around that left the dealer lot with aftermarket calibrations and have since run hundreds of thousands of miles. It all depends on how you drive it.
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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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