ive never done it, so this could be wrong but...
on the tailshaft that runs through the back of the box to the spline that the prop slides onto, theres a small worm gear circlipped on. These can be changed, to suit the wire drive, or 'leccy pickups for the speed sensors, and I think to can swap between all the setups from s12 mk2 box thru s13 thru to s14, but does mean pulling the box apart to swap.
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