Can you post a screenshot of the 4th TCC unlock table?
Not sure if this is what you're looking for... This is what pops up when I go to Tables>Transmission Tables>Normal Mode TCC Release Speed Vs %TPS Vs. Gear.
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If you download the demo from the JET website or the full installer that 1998_K1500_Sub linked to above then you can look around for yourself. They come with example files from a 2011 truck to play with.