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Message: <blockquote data-quote="Tom Schindler" data-source="post: 618243" data-attributes="member: 56140">If you read the "Scheduled Maintenance Guide" it says nothing about changing the tranny fluid, except for certain models of the tranny's. The 5R55E is not listed. It does say on motorhomes, such as my Dad's, to replace the brake fluid every two years.The Trac's power steering system requires Mercon tranny fluid only.You are right though, PS temperatures don't get as hot as tranny's do, but Ford still found it needs a power steering cooler to keep the temperatures low. The power steering fluid does get nasty and changes color as it gets older. I guess I prefer to be on the safe side. A trashed power steering pump while on vacation can ruin a good trip. If it goes out, there is no doubt in my mind it wasn't caused by me....and yes, I flush my brake system.I know people that have never changed out thier tranny fluid either with the tranny outlasting the vehicle. According to the "Scheduled Maintenance Guide" the 5R55E should never be serviced. Who here changes thier tranny fluid? It isn't needed...according to Ford.heck, if the axle is never submerged, the differention never needs services either, though I still service mine.Tom</blockquote>