To be fair I never ran the idle mod I made the 4 gearbox as soon as I got the CR2 as mine was the 3 gear version with no idle mod! I do agree with what you are saying with the mass off the lay shaft and slipper rotating in the same direction the initial Inertia would help the car to grip up under power. The gearbox was made so the full gear cover could be used to keep the sand out on an astro track and to help with still getting the right gear ratio on more motors.
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