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The stock pumps are fine. Get a Motorcraft or Motorcraft reman. To ensure the pump holds up, refill the system with MerconV fluid and its not a bad idea to install an inline filter in the return line. Then you can just replace the fluid and inline filter about every year or two. The reason as many OE pumps fail as they do is because the fluid does not get changed as often as it should, and any debris just recirculates till it does damage. A filter solves this problem, but the fluid still needs periodic replacement.