A gearbox takes an input shaft and converts it via various ratios to multiple (max of 3, min of 1) output shafts. It may be designed and built on a gearbox assembly table.
A complex item, a gearbox is listed in inventory as "Gearbox:<outputs>", where <outputs> is up to 3 <outputshaft><ratio>, <outputshaft> may be A-H, ratios vary from 5-900+. Examples are:
See also: Gearbox Design guide.