Originally Posted by Deserthucker
They would need a ratio change in the transmission to make a even range between gears.
That's true to a point. Perhaps they will change one of the planetary gear sets internally to enhance the ratios. For the Hemi, too many rations (i.e. a 7spd or 8spd) would be too many shifts and wear & tear for a nil performance benefit.
In an automatic transmission like the 545RFE with three planetary gear sets there can be more ratios "created" by programming which clutches are engaged/disengaged. The current 545RFE was originally a 4spd (45RFE) and became a 5spd via flash upgrade. People with the 45RFE 4spd were able to get a flash to then have a 5spd. Our 545RFE is already technically 6spd in that there are two different 2nd gear ratios: one for acceleration from a stop and one for kick-down passing acceleration while moving.
With the 65RFE that is coming out in 2012 at least two different (non-Chrysler) drivetrain engineers I know have stated they heard it is the same 545RFE but modified. To what degree they will only know when their respective companies buy one and tear it down in the ever-continuing study of the competition.