I too believe that the losses in an automatic are basically converter
driven. A torque converter is a torque multiplier which uses a stator
between the drive and driven members to redirect the fluid from one
member to the other accelerating power. As the rpms increase and the two
members speed becomes closer, the stator begins to rotate with the drive
and driven members and torque multiplication disappears. The problem is
that there is always slippage in the converter, roughly 400 rpms.
We now have a transmission dyno at Shasta College, I will check with the
instructor and see if he has any light to shed on this question.
Tom, Redding CA - #216 D/GCC
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