RE: Converting a TT01-E to a TT01-E(D)?
I just looked up the specs, and it appears the TEU101BK will only handle 27T motors.
It appears you will have to gear up, after all. If you are stuck with a 27T, just get a larger pinion.Though a 27T will have enough power to get you going, you will want a bit more wheel speed.
When you get a few extra bucks, it would be a good idea to upgrade the ESC/motor.