No i haven't found an alternative but im not entirely sure that its possible just to drop in different gears...i understand the basis of planetary gears but not how to configure them

Hi...has anyone any experience or technical knowledge regarding altering the reduction gear ratio?
It seems a mechanical mod would increase performance without requiring electronic mods however i must state i have very limited knowledge regarding the execution of such a mod and was hoping there might be an engineer or two that might enlighten me on my foolishness or congratulate my genius...