I consider an overdrive any gear with a ratio greater then 1:1 where in a traditional RWD layout the output shaft of the transmission is spinning faster then the engine's input.

Which puts me in a conundrum, In the Spec-V (and other FWD-6MT Nissans) 4th, 5th AND 6th Gears are all > 1:1

So I have a Triple Overdrive gearset. See, That's why I'm so much faster