Nekolai1

I just bought a badass Rustler from a friend because he was in need of some quick cash.

This think was super cheap for what i got it for and is highly modded
It has a Mamba X ith the Castle 5700Kv motor but it came with a stripped pinion and no spur gear... Any idea on where i should start with tooth count? I have no idea at all. It came with a few 90t Pinions and no spurs but I've read 90t pinions are prone to stripping quickly. Any thoughts?

olds45512

iTrader: (5)

The 90t gear is the spur, not the pinion. The pinion is the little gear that goes on the motor. I would start with the 90t spur and a small pinion, maybe 17 or 18t and then run it to see how hot the motor gets. Get a temp gun and stop the car every minute or so and check the motor temp, you really don't want it over 140°, if it's getting to hot you need to run a bigger spur or smaller pinion if it's possible. If heat continues to be an issue you can add a cooling fan to the motor which will help keep it cool and extend run time.

kevinatfms

iTrader: (10)

Grab a 54 tooth, 32 pitch spur gear for a Jato. Part number 3956.
For the pinion grab a 32 pitch, 14 tooth pinion gear. Part number 3944.

I ran that setup on a Rustler for years. The 32p gears(0.8 module) are quite a bit beefier than the 48 pitch gears that come stock. They are easier to mesh, run more true than the 48p gears and have better resistance to dirt, grime and impacts. The only downside is you cannot run the stock gear cover(but you wont need it anyways).