Thread: Transmision and Torque Converter Tuning discussion
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Old Wed, April 15th, 2009, 10:57 AM
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Oh, I forgot to mention that the ONLY time you'll see 4th gear below 45 MPH is when the PCM is in "cold transmission" mode.

You will find that before the transmission warmup (delta TFT @ startup vs. current) takes place, 4th gear will be commanded around 35 MPH. However, it's not useful since torque converter clutch operation is inhibited at this time.
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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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