Right now they have metal gears, steel gears, and metal 3:1 gears. I talked to Bill a week or so ago, and he said that he is getting the 3:1 in steel, but that they were still in production. He said a week or two out still... sounds like the best of both worlds.

http://www.rccommand.com/Tank%20Upgrade%20Parts.php

If you haven't dealt with RC Command, they just don't get any better, and he's here in the states