[Cory]

Crab drive is not something I would call "Fairly simple" I would not attempt it on a rookie team unless it was comprised of many people who had formerly been on teams, and you have good machine shop support.

here is what I would do. A simple 4WD system using the supplied gearboxes would be decent. even better, imho would be a simple sprocket and chain setup with the drill motors. You can use the supplied mounts, and with just a little work mate the motor with another shaft driving a sprocket and chain reduction to the wheels. This is fairly simple, and from what I have seen, seems to be more reliable than the FIRST gearboxes, which dont allow you to chose what gear ratio you think would work best.

Cory