When it is put into any other gear than d, an electric bypass of the fluid in the transmission happens. It rather an extensive technical issue the way the tranny is set up like this. My understanding is that it allows for more continuous power with out allowing the torque convertor to lock up at all. It operates like an old power glide at this point.
They probably did this so if you are probably stuck. Its easier on the tranny and power train. I really don't think they engineered it to be used this way on hard surfaced roads.
When in 2nd mine does shift up from 1st.
Lars
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