fast Lego technic 2 speed trial truck axle with rc buggy motor (more detailled view)

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This is a more detailled view of my currents project rear-axle.
Its gonna be a fast Lego technic trial truck / crawler.

This test is just to see the shifting mechanism, and the different speeds.
The axle consists of 2 rc buggy motors and 2 seperate gearboxes.
1 buggymotor + 1 gearbox for each wheel.

The gear-ratios are:
1:3 from fast output in fast gear ...and
1:15 from slow output in low gear

this results in a total difference of 1:7 between the 2 gears.