Gearbox question

Chris k

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Happy new years!!

Is it possible to put an 78' gearbox into an earlier 75' motor? (Both 447 motors) I know that Yamaha changed the shape of the gears for the box in 78' but will they match up with the crank and clutch on the 75'?

I have the chance of a cheap gearbox that's in good order and I'm wanting to install the overdrive 5th gear by swapping the gearboxes in the next rebuild.....
 
yes will install as a set of gears and shafts, like you say; can't just mix n match gears on shafts. AFAIK any year tranny into any year cases, early trannies (70-71?) have a higher first gear (close ratio) Things changed in the crankshaft to clutch gearing, shaft lengths, when they added the electric start in 72
 
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