Nitro user here trying to get into the world of the electric drift!

I got this Tamiya TT-01D Coppermix Drift Spec a while ago and want to convert to the near maintenance free Brushless. I eventually got it down to wanting to use the 10.5 Novak Ballistic with the Novak GTB. As I researched around some more, I run across into another problem that the worker at my local hobby store talked to me about. What about that drive pinion gear to turn the Spur gear to make the wheels move? He says that I can't just use the Tamiya Drift spec brushed motor's gear thing and just shove it on the Ballistic. Then the other worker came in and interrupted and say I could possibly do it if I have the removal tool. So now I am confused as heck!

Since my electric car is a RTR model do that really mean I have to replace many more things just to make it into a brushless system? Will my receiver have to be replace too? Maybe I should just leave my Coppermix TT-01D alone and just try to make a new brushless one from scrap? Please enlighten me on this! Thanks! ^_^