Originally Posted by AreCee

A GTB will barely fit but does if you file the corner of the output board to clear the screw bump along the backbone of the chassis. It will fit in there because I used it for the TCS, however, I got rid of it for a Tekin RS Pro which fits in easily including its tiny cap. (Never was a big fan of the orange junk.)

Just play with it and you'll see that it will work but the Tekin or LRP is so much better.

I should have mentioned that you want to place the GTB so the power wire cb is facing the motor.