The Tesla Roadster was supposed to be out before the end of the year, but it looks like the wicked-fast electric car won't make that target -- apparently the company is having problems finding a transmission strong enough to handle gear shifts while the car remains at full torque. The problem is somewhat unique to electric cars, and Tesla's got two different suppliers scrambling to find a solution -- but in the meantime, the company is considering providing vehicles outfitted with "temporary" transmissions that are basically guaranteed to fail after a few thousand miles. The first of these has already been built for company chairman Elon Musk, and Tesla is deciding whether to start shipping cars with the temporary units to other customers and then replacing them when a final transmission becomes available. That's the price of progress, we suppose, but something tells us quite a few people would rather just wait for the final product.