When you see someone post a tune and it says to:
1) Reset Transmission
2) Adjust Final Gear
3) Move Top Speed Slider to Minimum
4) Set gears 1-6
5) Adjust Final Gear
THAT is the transmission flip. I never knew exactly what it was either. I guess it's that SECOND setting of the Final Gear after you've also moved the Top Speed slider which is what NOW makes your transmission reset back to default values once you bring your car onto the track. The majority of tunes instruct us to set transmissions the way I described above, so literally thousands of people's cars are now being severely impacted by this recent change by PD.