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OK Looking into this more:
While the top two cogs are overdrive gears on both the 8L90 and the 6L80, 8th is a 0.65 ratio in the new transmission, compared to 0.67 for the 6L80, and Chevy has paired it with 2.41 differential gears in non-Z51 2015 Corvettes (compared to a 2.56 ratio for the 6-speed auto) to reduce engine rpm by 8 percent at 70 mph.
First gear in the 8L90 is 4.56 as opposed to 4.03, and the closer steps between ratios mean improved performance as well as better fuel economy – Chevy is claiming 29 mpg highway, 0-60 in 3.7 seconds, and an 11.9 second quarter mile for the 8-speed LT1. Overall, there is a 7.0 ratio stretch between first and eighth gear.
It seems the transmission controller is NOT part of the PCM, but a stand alone part.
Also it looks like there are three modes of shifting, auto, manual and paddles...OR switches...
Now to find out if it even needs CAN BUS.
Rich
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