get the water pump kit. changing the impeller only will get you by but changing the plates and gaskets will make your pump pump stronger. changing the pump and impeller is pretty straight forward just notice how you took it apart and put it back together that way. the only thing you really need to make sure is to put the impeller blades facing the right way. when you pull the housing off make note which way the blades are bent and put the new one the same direction. you'll see what i mean when you take it off.
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