To add on all other answers, OD gear was first made as a separate unit, not part of the transmission box but connected to the transmission’s output shaft. There were also options with the OD in the rear axle.
And this was also the reason why it was toggled by a button, it wasn’t a part of the transmission, it could also not be a part of the gear selector.
And with the button, it could be used on the last, or second last gear, giving you more gears all together.
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