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If the gearbox is from a swingarm frame,it definitely will fit.Some of the later rigid boxes had the same centre distance on shafts,from about '53.Early rigid boxes have a shorter centre distance,and it won't fit them.

You need to open the housings near the mainshaft bearings,even a file will do for that.You need the whole gearset & shafts with output bearing & seal,camplate & selector forks,gearbox sprocket (different spline),quadrant on inner cover,and shift quadrant & plungers from outer case.
It would be a good idea to use the later needle roller layshaft bearings and thrust washers too.
 

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If the gearbox is from a swingarm frame,it definitely will fit.Some of the later rigid boxes had the same centre distance on shafts,from about '53.Early rigid boxes have a shorter centre distance,and it won't fit them
And I wish I had Known this a couple of years ago when I machined out
an early box for later shafts/gears only to find out they won't fit!
About 040 if I remember!!
Live and learn
 
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