Abstract: A toy vehicle transmission assembly unit having a drive gear that is nonrotatably mounted on a driven axle, and a multiple gear train that establishes a driving connection between the drive gear and a driving gear mounted on a shaft outwardly extending from a motor. The gear of the multiple gear train that immediately establishes the driving connection with the drive gear is shifted laterally by a shift lever that disengages the gear train from the drive gear. The transmission assembly unit is enclosed in a housing that provides a rotatable mounting for the drive gear.

Abstract: A transmission that uses a gear set in the form of a pair of gears stacked rigidly together to couple a driving gear to a driven gear has its ratio determined by the relative number of teeth of the stacked gears and the gears with which the stacked gears mesh. If the number of teeth of either or both gears in the stack is varied, the axle of the stack must be moved to a different location in order to keep all of the pairs of gears meshed. The transmission has two or more axle-receiving locations to receive the axles of stacks effecting different ratios. To simplify assembly, the stacks are color-coded according to the ratios they effect. Stacks of the chosen color will only fit in one axle location. The selected stack may be enclosed in the transmission housing so that its color code will not be visible after assembly of the transmission.