newb need feedback to get maxx wright

hi there guys
i am a newb . igot gorilla max g2with extension chassie addon and g3 suppsion with integra piggy back shocks ,mip axels and novak hv bl.i was having trouble with heat shutdown runing 70t spur and 14t pion run 2x 3800 6cell . now running 7cell but have changed spur to 72t and pion to 12t . truck has that much torq its not funny. think i ll change pion to 14t. the big prob is my diff it keeps brakeing iam getting a robinson 1 do you think it will hold up to it .or what would be a better option. i allso need to change center shaft but need one for the added extension on gorillamaxx chase .can any body esle think of other stuff i need . want to race it but having trouble . allways something going wrong. but shit happens