Looking at my Trans logs I see that the TCC is releasing at 66 kmh in 3rd rather than 50kmh as per the tune. 65 kmh is the appropriate release speed in 4th according to my tune. This explains why the TCC is constantly locking/unlocking in 3rd. Why isn't the correct table being used?
Also seems that the TCC is locking during upshifts even though D2801 is set to "NO"??