>From the sound of it, when you are in "neutral" 4th gear is still selected.
Did you try resisting the turning on one shaft while turning the other. Slight
friction may make both turn simultaneously when really in neutral.
If the input and output actually turn 1:1 then the 4th gear MUST be engaged.
When you then enagage any other gear too, it will lock up.
Check out the front synchro hub. There is a front and back. On one side the
"neck" adjacent to the interlocking lugs on the output shaft is taller than the
other side. I fail to recall which way it goes, but it is NOT obvious. At
least it was not to me. I do not know what effect reversing the hub has, but I
bet this might be the culprit.
-Tony
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