Green machine.... For gear ratios, I believe 18/66 is stock, so probably work from there with those 600 can motors- probably get away with larger pinions though I bet.
mike has 12t to 25t mod1 pinions here - and depending on the shaft size of those motors, you would probably need the bore reducer as well with each pinion.
absolutly beautiful, nice truck man those motors are pretty good actually a friend of mine has them in his emaxx and it i goes for a brushed truck, he runs 58t spur and 18t pinions if i am not mistaken (32p).