The upper and lower gear housings are machined as a unit. The skeg casting was NEVER available by itself from the factory. A freeze crack usually occurs down by the 303358 pivot pin. A crack by the seam is usually the result of hitting something while being trailered.
![](https://www.walagata.com/w/chapsboy/PartsBooks/57_35HPpg12.jpg)
![](https://www.walagata.com/w/chapsboy/PartsBooks/57_35HPpg13.jpg)
Hope this helps –
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