Smallest fit I had to do was the FT-17

These are standard HL gearboxes. The motors were changed out from the stock 380 to a smaller format motor for two reasons.

First reason, physically the stock 380 can was too long not allowing the clearance needed to keep the narrow nature of the vehicle. And second, electronically smaller motors would be more efficient. A large powerful motor was not necessary as the smaller motor would be compensated with a custom 2x gear reduction fabricated on the first stage so torque would be maintained. Smaller, more efficient motors will have less current draw thereby eliminating the need for a large stick battery.

Anything smaller than the FT-17 would need to go 1/24 scale!