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Another guy in our electric car club tried using an automatic transmission, I think it was a Toyota Corrola and found that his range was 40% worse then the same set up with a manual transmission, he said his car was also pretty slugish.
If you want the vehicle to shift automaticly why not use something like an Arduino that can over ride the throttle, have a speed sensor on the motor shaft and the output shaft of the transmission and some solinoids to shift in to neutral, match the speed for the gear it needs to shift in to and shift in to that gear without the use of a clutch, that way you keep the driveline lighter weight and simple and you don't wear out the syncros in the transmission.
A lot of EV's like mine have a single speed gear box, others like my parents use the manual transmission but are driving in 2nd gear most of the time ad 4th gear on the highway.
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