Hypothetical question!!
IF i had a M20,M21 or M22 COULD i take the gears out, swap them with a set from a 3 speed and replace the 4th gear with a pair of gears from something with an overdrive?
I have never seen inside a manual gearbox so i don't know if this would be possible.
It was just a thought, rather then changing diffs (from say 3.08 to 2.78) and then POSSIBLY give a better rev range between gears compared to a M21 with a 2.78
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