Tamiya 70103 universal gearbox has a thin, compact, metal frame, making it the smallest Tamiya gearbox. The final two gears are metal, making for a tough output. A worm gear allows for the high gear ratio options of 101:1, 269:1, and 719:1. The main output shaft can be oriented in four different directions, and a small, auxiliary output shaft turns perpendicularly to the main output shaft.
The Tamiya Universal Gear Box works well in a variety of applications and can be mounted several ways. A hex shaft and a threaded shaft are included to give the builder flexibility in design. The plastic gears and metal gear box are all high quality.58:1 and 203:1 gear ratios possible
Motor: 29mm + 8mm shaft = 37mm total length and 21mm wide
Motor + gears: ~55mm long + 11mm shaft = 68mm total length
Motor + gears: 36mm wide (including mounting points) and ~23mm height