Aluma: rc-cross.com has a TB01 spur gear adaptor, it *may* work, do ask the other members for confirmation.
OTOH, whilst on my TB01 with the carbon chassis, i.e. visible spur gear we use the tamiya AV pinions and spurs. They have much less gear ratio and run very much noisier, but they seem to last very long. I did run the 0.4 for a while but they are a bitch to mesh andn strip too easily. Running costs were too high ;-) So went back to the AV stuff.