Quoting George Staples
Is this the one from your 6x6 trial truck? It's pretty ingenious. Why do you have two shifter motors tho?
Yes it is. Thanks, I use two motors so I can have complete control over the three gears. With one motor, it's too hard to stop the change so the gears line up perfectly. This set up makes it so each motor is limited to stop right at each gear.