So, took my MF out yesterday to Bell Smith Springs in southern IL. It doesn't like my Castle Mamba Max/2200 and 4s apparently. First I noticed something wasn't pulling, figured it was the hex spinning in the wheel, sure enough, rounded. Then the other hex jammed itself between the flat spots in the wheel and spread it out. I kept driving it anyways until the rear end started stripping. So I drove it in front wheel drive until I got back home. Anyone know what diff gears to use to upgrade these? I found a how to on RCCrawler about swapping to HPI Savage 21 gears but the part number for the Kyosho item I need was no longer valid and the pics no longer work since it's an old thread. I have some stock replacements on the way and a set of the HPI stuff in case I can make it work.