DJ,
I think that has to do with the PCM being able to test whether or not the transmission actually shifted by way of the ISS and OSS. I wish the factory PCM calibration would perform a 1-2 shift at 15 MPH.....instead of 9.
If I'm wrong, please correct me. Try it!
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Tuning, flashing, burning chips, and repairing all aspects of 7.3L Powerstrokes.
SEVEN 7.3L-powered vehicles in the driveway. Two didn't come that way from the factory!
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