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I know this could be a stupid question but would you have to change the gears in both axels?

Not if you never use 4WD! <img src="/forums/images/graemlins/lol.gif" alt="" /> Yes, the gears must be the same ratio front and rear. Very important! <img src="/forums/images/graemlins/cheers.gif" alt="" /> There are no stupid questions on this board! <img src="/forums/images/graemlins/baby.gif" alt="" /> Besides, the dumber the question, the more likely you'll get the right answer!