Trying to replace waterpump impeller and I can't get the lower unit off. I was able to disconnect the shift rod at the coupler and the only thing I can see still attached are the drive shaft and water tube. Shouldn't these just pull out of the pump housing or am I missing something? Is corrosion my problem, I don't want to force the issue and break something? Any tips I'd appreciate. I've changed a few of these and never had this problem before. Thanks
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