One big downside to more gears is that the computer has a hard time deciding which gear to choose when downshifting. I have said it before, but the chrysler 8 speed is particularly appalling in this regard.
I like the 6 speed in my cts. It will be in 4th by 25 mph and 6th with od and tc lockup at 42mph.
From driving a few modern vehicles, i feel they all could benefit from more torque, more converter lockup, and faster shifts.
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