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Are you aware of the inefficiency of running an auto trans? You could be dropping as much as 25% of your energy/power in the auto. Have you considered setting up a fixed gear reduction drive? Toothed belt drives don't require lubrication and are very efficient. I don't know the layout of your vehicle but if the differential is seperate from the transmission and has bearings that can handle the radial forces of a belt drive then this would be a much superior option.
Of course, with a fixed ratio reduction, you may have to spend a little time working out the correct ratio to give a good balance of acceleration and top speed. I can help with this. Also, you'll have to take into account radial forces on the motor and differential. The belt/pulley manufacturer should be able to help with this. What motor are you using?
Just a suggestion.
Sam.
Of course, with a fixed ratio reduction, you may have to spend a little time working out the correct ratio to give a good balance of acceleration and top speed. I can help with this. Also, you'll have to take into account radial forces on the motor and differential. The belt/pulley manufacturer should be able to help with this. What motor are you using?
Just a suggestion.
Sam.