There will be a HUGE difference in gearing between brushless and brushed. As the FDR numbers go up, gearing will decrease, meaning that the motor will make more revolutions compared to one revolution of the entire drivetrain. The higher the FDR, the more the motor turns to turn the drivetrain once, this equates to more tourqe and less motor strain. Running a high gear ratio will be a low FRD, meaning that the motor will spin less compared to one revolution of the drivetrain. this means more top speed and more strain on the motor, batts, and speed control.
To find the FDR of a car, take the spur and divide it by the pinion, then multiply that number by transmission ratio.
In simple terms, a 6.36 will have more top speed than a 6.8.
Hope this helps.
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