Tamiya’s 3-speed crank-axle gearbox looks very much like half of the twin-motor gearbox (with an added gear ratio option). This compact gearbox can be built in one of three gear ratios (17:1, 58:1, and 204:1), and is Tamiya’s cheapest, general-purpose gearbox.
The Tamiya 3-speed crank-axle gearbox is essentially half of the twin-motor gearbox. The kit comes with enough parts so you can built the gearbox in any of three gear ratios (17:1, 58:1, and 204:1).
- 70093 3-speed crank-axle gearbox — This gearbox is solid gray and comes packaged in a box.
- 89914 3-speed crank-axle gearbox — This gearbox is clear and comes packaged in plastic bag.