New to site E-Maxx Help

Serum can I use the t-maxx RRP 72 slipper buy the 32 pitch pinon from here and the ideler my biggest concern is the 31 tooth plastic gear in the tranny trying to find one in steel as I want it to be bullet proof. I have 2 sets of 3300match pack batteries and have some 4200's that Ballistic will make me a little afraid to run LIPO as with my mini inferno's I ran thunder power 3s pack and fried it what do you think.