Probably for a couple reasons but this one comes to mind first:
The manual transmission is more durable.
Other reasons may have included the automatic transmission's perceived better performance due to converter fluid coupling slippage and torque multiplication vs. the manual that really doesn't even start to get out of it's own way until 1800 RPM.
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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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