Metal output gear?

[A RC Dude]

Hey guys, my e-maxx is the old style with a ton of upgrades.
It has one big problem recently though. has distroyed two of the nylon output gears in the past month and with the new battery i just put in it, i was only at about 80% throttle in grass when it happened. So my question is does anyone make a matal output gear for it? and if so, would you recomend it?