Broken UltraMaxxed gear?

[JOHNNYMAXXIMA]

Well I got my Maxx running again after breaking one of my titanium control arms. So I was driving it around today and all of a sudden it comes to a rolling stop. Gave it some trigger and all I could hear was the motors spinning. So I pulled my body off and I saw that the spur gear was about a half inch out away from the pinions. So I took the tranny apart and this is what I found.

So how do I fix this? Does UltraMaxxed warranty something like this? I can't remember if this was even part of the Ultramaxxed gear kit or is it the stock pin that I broke?
Thanks.