I have learned that upgrading all the gears in my E-Maxx trans is not quite enough. There's still 2 weak spots... those 2 thin carter pins! I've broke them about 3 times now. Well I doubt I'll break them anymore. I replaced them with solid steel wheel pins. Then I welded the ends to the gear so that they won't come back out. This has been the only weak spot in my truck since I've fully upgraded my truck. Hopefully it's finally 100% BULLETPROOF now. Time will tell....