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NOT changing your fluid and filter will cause problems down the road. Changing the filter is more important than the fluid (be sure you do not just change the fluid). Also, be sure to clean the pan and the magnet well, and COMPLETELY dry it. What's it on? Chances are, it will actually help extend the transmission life greatly if you replace fluid and filter about every 20k-30k miles.

I asked that very same question of my transmission mechanics yesterday! Here is their very firmly stated answer:

* If you know the transmission history, and that the fluid was changed somewhere in the previous 40K miles or so, then yes, drop the pan and change the filter.

* If you do NOT know this fluid change history, then do not do it. The transmission builds up tarnish and the like from normal usage. The detergents in the new fluids will clean those 'contaminates' and is very likely to put the transmission on a path to failure. Other than checking fluid levels, leave it alone I have heard this advice from a good number of professional mechanics over the years.

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Q: Will replacing the transmission fluid and filter in a 2003 Ford Windstar cause further problems down the road?
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