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In my big truck I have an 4 speed trasmission with a low gear, a hi range selector with Drive and Over Driver available in every gear.
That, of course, is why it is called an 18 speed.
And no one can remember if they are in 12th or 13th.
So we say "you are in 6th Over Drive" as opposed to 12th. It is just easier to remember.
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And I come from the day when cars had "Three on the Tree" , "Four on the Floor" or slushbox's.
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