Flush the rodeo trans

Do you need to put it on "D" to flush the torque converter on a rodeo or "P" is just fine?

if you don't shift from "P" to "1" during flush, would the new oil go to every places anyway?

I heard that if it's electronic controlled then you need to put it on "D" for the torque converter to turn.

And, the TC has a drain outlet to cool the oil or the oil returns to the transmission and then get cool?

Just double check.

The torque converter is always turning as long as the engine is running.

Besides, I wouldn't recommend flushing your trans anyway. I've heard of too many people having even more trouble after a flush.

what I like to know is how much left in the Valve Body if I don't shift during flush?

How much would be considered "over fill" a trans? 1 qt? .5 qt?