I need to dig into understanding the lockup function control one of these days, but your description sounds exactly like what I'm experiencing. At ~ 40mph light cruise throttle at 2000-2200rpm, the O/D will unlock with a corresponding rpm increase. When I squeeze the throttle just a little, the O/D locks with a corresponding rpm decrease. To me, it's counter-intuitive - particularly on increasing throttle pressure, because it's locking the torque converter at an rpm point where torque is not high enough to get good light-throttle pull. Further pedal action gets the kickdown, but it takes more throttle travel than what seems to "feel" right. What I'd really like in that situation is for the torque converter to go from locked to unlocked with light with light throttle pressure - and then shift to third gear on continued increasing pedal without requiring a lot of pedal travel to make it happen. I don't know if I can make it do that.

I agree with Kevin when he says it's easy to understand why we now have electronic controls on transmissions.

Frank