[Astarties]

I've always seen our robots favor one side over the other (which we fix with code/calibrating). But what your saying sounds to be more of a major difference. Make sure all your gears are set right in your gearbox. I remember a couple of years ago, someone else on our team put together our toughboxes. One of them was good, but he had a couple of the gears in the other flipped (so the lip on the center hole was on the wrong side) and the gears were rubbing ever so slightly on something (don't remember if it was the side of the toughbox or if it was the other gears). Also, make sure you're lubricating the gearboxes and chains. I've seen pictures of teams holding a pile of metal dust that used to be the teeth on the gears in their gear boxes. This is caused bay lack of lubrication.