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I think you probably figured it out with them running the wrong way (motors fighting against one another is the number one thing that will kill the gear box....particularly when they happen to be on other robots). I'd also try to loosen the tension on the drive train (I'm assuming you mean the chain; having that too tight will put a sideload on the drill motor/gearbox which is definately a bad thing). Also, make sure that there isn't too much friction in the drive train. If there is, reduce it to make the gear boxes last longer.
Matt
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