I would say the only weakness was the front shock tower, you should still be able to get some non-kyosho carbon ones that was quite thick and very strong.
as for gearing im not sure on those motors. just start with something small like 18 tooth pinion and see how it goes. keep checking the temp of the motor and esc regular. If its cool after 2 or 3 minutes and car is of the pace you should be able to gear up.
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