My 2000 2.7 started seeping during the summer of 2009 with 81,000 miles. I replaced the original pump with an OE from Sunset ($197). I believe I caught it early. The impeller was in great shape. While there I installed the LN 160 degree thermostat and replaced the coolant.
There didn't seem to be a consensus about an aftermarket pump versus an OE pump so I went with the OE.
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