Impeller

[fairwayphilly]

I'm going to change my impeller this fall when I winterize my boat and change the gear oil. I've never done it before and I was wondering if I just needed to buy the impeller or the whole impeller replacment kit with the gaskets and seals. The kit is about three times as much and I was wondering what exactly it is that wears. Also is there anything else that I need to adress or check over while I have it apart?
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