Hurt tranny, what to do?

[Bmr4life]

I ran my E-maxx for the first time with 12 cells on the 10L. About 7 or 8 mins into the run, I blew 8 or 9 teeth off of the high speed idler gear. I see that there are steel idler gears that I can upgrade to, but won't that just cause another gear to strip. I would like to know if there are any other metal gears for the e-maxx tranny? Also, is there an upgraded input drive shaft gear because I've busted the pin in one of those before. thanks