Log In The automatic gear system going out can be a massive pain because often the vehicle simply won't change gears in its normal position. In that case, you have to drive it in another gear, which probably is horrible for it. Anyway, as noted in the link above, a broken gear system can also cause the speedometer to go out. That can be bad because, while being probably illegal, you also cannot tell your speed - making you more prone to speed. Oh, by the way, of course, what are some good tips and deals on fixing the gears either by yourself or by hiring help?