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understanding 3 speed gearbox conversions
#8
1) 1st/Reverse:
The 26 tooth gear slides forward to mesh with the 16 tooth gear for 1st gear.
The 26 tooth gear slides backwards to engage with the other 16 tooth gear. Note that 16 tooth gear is behind the main & lay shafts in the diagram.
The reverse gear is permanently meshed with the 12 tooth reverse idler.

2) The Andes gears are a straight replacement for the 20 & 22 tooth gears. The dog clutch on the 22 tooth gear is also modified to ease engagement of top gear by chamfering the side of the dog teeth on the trailing face. This can be seen on Parazine's picture.

3) There is no modification to the shafts for close ratio conversion. It is just the gear wheels.
Jim
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RE: understanding 3 speed gearbox conversions - by AustinWood - 16-06-2020, 09:25 AM

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