When replacing your waterpump, use only a WHITE Impellar one (not black like the stock one) or a metal impellar one.
Metal will hae to be purchased from napa, etc.
White is from the dealer or napa, autozone, etc.
Metal CAN'T shatter, but CAN leak around the shaft.
White CAN shatter (though I've only seen three.. ever..) but doesn't tend to leak.
I would recommend white, personally.
$70-ish at parts stores.
Biill J. is another option, and so is Steve at Tousley ford (contact in duratec maintenance forum, under the pinned FAQ)
Ray
