Not a PCM problem.
It's an internal transmission problem. Sounds to me like you experienced a 1-3 shift in your first post. That usually means a broken intermediate sprag....but they usually break and never work again. You won't find pieces in the pan from that failure.....unless you drive it for a few miles after the breakage.
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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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