Do you have the i4 or v6? The i4 tranny is the CD4E referenced below. It really isn't changable. The 4EAT tranny (v6) has a replaceable filter (sorta) it's more like a screen but I still went ahead and added an in-line filter from magnefine (do a search).
The mesh filter on the 4EAT ATX oil pan filters only to 200 microns. Inline ATX-specific filters can be fitted which filter down to 50-10 microns and so remove abrasive clutch material as it occurs rather than circulating it around torque-convertor, clutches, valve-body, oil pump. Traditional "spin-on filters" & adapters are available.
The CD4E transmission has a filter, but it is embedded deep inside the transmission for some reason known only to Ford. Thus it is very advisable to buy an external inline oil filter (eg, www.permacool.com) and do a complete fluid change annually. The transmissions are rated only slightly above the US AXOD Taurus transmissions, and so the use of cheapest-brand full-synthetic annually may be advisable since some problems are as much design as overheating related.
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