RE: I need help with gearing
Your stock gearing is a good place to start. If it's pretty warm where you are, maybe drop the pinion to 19....but like Foxy said, get an IR thermometer for accurate temperature monitoring for gearing selection/confirmation. I don't know that going 3S is a good idea.......are you sure your drivetrain can handle it? If you're going for speed runs, 3S would be ok, but for bashing, it's just too much. Better to spend the $$ on LiPos with a higher C-rating. .