You must be dyno-ing an OBS truck. You're right, there is no duty cycle percentage for the torque converter clutch lockup with those trucks because the TCC solenoid and associated valving is a simple on/off setup. If it's still not working, I don't know what to suggest since that would be the most logical step to take.......I've not had a need to do anything like that yet.
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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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