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Most motors have continues amp ratting and that is most likely the 9kw ratting that you are seeing, often times the peek draw of the motor can be 4 or 5 times that, you might see that peek draw while starting from a stop or going up a hill.
personally I think 48 volts is too little for a full size car, my 1,400 pound electric car is 48 volts and it has a top speed of around 35mph and slows down to about 25mph going up hills with it's 6kw motor altho your motor might be heavy enough to bump the voltage up if you are only running it for 10-15 minutes at a time.
I have a slow blow 300 amp fuse, this allows it to draw over 300 amps for a fraction of a second, I've seen it draw over 400 amps a few times and have not blown a few yet.
It sounds like the Diesel gear box is going to be the way to go if you use the motor you spoke of.
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