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If your gears rust it wont matter if theyre mod 1 or mod 1.5. Not saying theres anything wrong with changing to mod 1.5 but it just more pinions you have to buy and 1.5s are usually more expensive than 1s so unless theres a reason to change or you just want to, I probably wouldnt. :2cents:

Why do you want to put mod 1.5 gears on it? Its not really necessary