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The overdrive switch is the top part of the gear shift knob, when fitted. There would be two wires running up the lever to the knob. The overdrive is attached to the back of the gearbox.
The definitive way is to get under and look at the tail end of the transmission. If it resembles, more or less, a tapered extension at the end it's not OD. If it has sort of a large bulbous chuck at the tail end, it's an OD.
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