Originally Posted by
rustnrot
I carefully marked the shafts and checked. The 1989s (actually have two) both measure for the 1.83 ratio, the 1977 is a 1.64. I did see a mention of both these ratios in a Merc book. And there is a definite difference -- very easy to spot. The 1.64 makes 1 and two thirds rotation of the drive shaft to one rotation of the prop shaft. The 1.83 as expected turns much further on the drive shaft (closer to two turns) for one rotation of the prop shaft.
I want a 1.64 ratio short shaft.
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