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Re: 02 f550 7.3L, manual trans
Posted to Transmission Forum on 9/26/2008

Is the PTO wired into the PCM, it may have a resistor wired into the PTO input to cause the rpms to climb. The PCM will ignore either an APCM rpm input or any other kind of auxiliary rpm input without the parking brake on.

The PCM "should" limit the rpm to 3... Login to read more.