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On a quick note, I would also like to mention the fact that mildly modified 4.6 engines and factory spec 4R-70W transmissions have been delivered as part of the Interceptor Crown Vic package (police cars) for years. Where I am from, the police run their cars up to 300,000 miles usually without any tranny problems and retain a good portion of their power. Aside from other more subtle improvements, the 4R-70W is an improved version of the AOD-E (electronically controlled AOD) given a stronger output shaft, wider stronger bands, and a stronger, more durable material in the clutch packs. Chances are with new tranny fluid the setup will give you many miles. If you'll only have it for a year, you won't need to change it unless the tranny is shuddering. In this case, replace it with Ford spec Mercon fluid. But, as many others that post in this forum will agree, you WON'T be keeping that car for only a year...wait and see.
-DG-
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