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I have a 2005 ford focus ZXW automatic I just recently purchased, the car originally was fine during test drive and everywhere else, no issues with the transmission fluid, you could tell it wasn't checked recently as far as fluid goes but it was within normal range.

Anyways, a day after buying it, everything works fine in the vehicle, but it started revving up around 3rd gear (getting to about 45mph or so) and take a few moments for it finally shift into gear, it was doing t occasionally, I finished what I had to do that day and came back home, took it back to where I got it from, they replaced the transmission filter and overdrive sensor and replaced the transmission fluid, after that it seemed to be fine when yesterday at about the 250 mile mark t started doing it again only this time it's much more frequent and also doing it at around 10-20 mph, but after that it was fine, re-checked tranny fluid, all good, not burnt or scorched, everything seems fine.

The car seems to not have the issue if I start up in the morning after sitting for a while, but as soon as it heats up a bit it starts or so it seems, may just be a coincidence. Any ideas on what the issue could be? I searched around and have seen numerous threads on here and on other sites suggesting it could be a solenoid, could be the speed sensor, could be this or that. I have no idea really, I don't want to start throwing money into something and just blindly replace things until it works.
 

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It sounds like both 2nd and 4th gear are delayed; and this could be caused by problems with the intermediate band inside the trans. If it is, this is one of the easier or least expensive repairs to be done on our 4F27E trans; mostly because it can be repaired without removing the trans from the car.

Here is a post I made a few days ago that contains several links that might help you read-up and decide what might be next for you.

Please have your OBD scanned for codes.

I rarely promote replacing car parts without good reason... but I do make an exception when the transmission is acting up. After checking fluid level and maybe some wiring tests (dependent of symptoms) I will often recommend replacing 1 or all 6 solenoids inside the transmission; but again, dependent of symptoms. This job is fairly easy or not too difficult.

I recommend replacing the solenoids primarily because it is one of the few things we can do at home and because it has a history of fixing many trans issues. Another somewhat easy home fix is replacing the intermediate band if/when you have no 2nd and 4th gear.

Here are some links that will help you learn some more and help you decide what might be best in your situation.

http://www.focusfanatics.com/forum/showthread.php?t=169493

http://www.focusfanatics.com/forum/showthread.php?t=467129&page=5

http://www.focusfanatics.com/forum/showthread.php?t=167830&highlight=p0750

https://www.youtube.com/watch?v=l36SjcB0FuQ

http://www.ebay.com/itm/FORD-4F27E-...Parts_Accessories&hash=item3cd493997e&vxp=mtr

http://philldesigner.com.br/ecospor...ansmissao_Ford_EcoSport_TRANSMISION_4F27E.pdf
 

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Easier to change the 2-4 servo piston than band and they commonly break the shaft to do stuff like that too. If enough mileage may just need a longer band bolt, they come in different lengths.
 
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