Gearing will obviously depend on where you race. I have a 84/19 with the 6.5t. As far as batterys go well I would go for the intellect ip 4200 or the new fantom 40c 5000mah packs. Going from a 20c pack which is the trakpower to a 30c intellect pack has made a massive difference. Car is a lot more punchy and the packs fit better than the trakpower with the diggity designs lipo tray.