I used to have 3-spd on my old 1/8 race cars, could use the gearing on a smooth track but not so sure about off road... Even the 2-spd is venerable as it sticks out further so I'd hate to think how far a 3-spd sticks out!
yeah your right duck, the 3 speed will only be for high speed drag racing or breaking high speed records,
no good off road, were would you want a 34x30 3rd gear :no: