Whats inside ? How does it work? The ratchet rotates the gear which rotates 2 cams which handle the cross gate shifts while also rotating a second gear that rotates a third cam to engage the gears, the results reliable shift between all gears with one simple repeatable movement by the driver #cars #carsofinstagram #shifter #tremec #r154 #cd009 #jdmcars #howstuffworks #engineering | S1 Sequential Shifter