Moeras, I don't think you're loosing it.
Under what possible circumstance would anyone need to have another set of 4 ratios in Low Range?
Fairey, and other make overdrives are not intended to have a "neutral" position, it's only that there is a spot in the throw of the sliding sleeve where it isn't engaged, that you could say it was in "neutral. If there was an intended reason for this, there would have also been a detent to hold it there. Just the slightest movement and it will be engaged in the normal final ratio or the lowered (OD) ratio, and that's a good way to wipe out the engaging taper of the sleeve.
OD is not really intended for anything other than lowering the engine revs in 4th when you're up to a cruising speed, but often used in third only because it's about half-way between 3rd & 4th.
If you looked at the possible ratio combinations, 4 Hi-IN, 4 Hi-out, 4 Lo-In,
4 Lo-out, there are going to be so many that are so close as to not even matter. If you wanted to get technical, you could even say it's 20 if you add
R Hi-In, R Hi-out, R Lo-In, R Lo-out, but so what,with a usable engine range of 4000 rpm, who needs them all.
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