RC 0.4 Pinion Gears (ie. 64pitch) are compatible with TB Evo 5 MS, so the above gears can be used. However, I can't remember the size (ie. no. of teeth) on the Spur Gear that came with the kit. 40/41T look like too large. (unless you are using the slower motors for drifting). There should be a recommended gear ratio table in the manual and you can check what size of Pinion gear should be used for what motor type.
