well i'm going with a big block single speed swap setup in my tornado

has anyone found a metal gear for the middle differential to substitute with yet??

i know that will be the first thing to break but oh well i got extras, i know i'll need em' along with some c-cups

and if anyone has done a big block in a tornado let me know what you have ran into doing this

and should a 9.9kg/cm servo be enough to upgrade for the steering/carb?? or should i go a little more around 12kg?