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Old 03-09-2015, 08:08 AM   #1
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auto trans fluid

I'm wanting to replace my auto trans fluid with amsoil. What is the best way to remove all the oem fluid so that I don't mix the two?
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Old 03-09-2015, 09:16 AM   #2
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You'll have to drop the pan and remove the converter. Are you doing a converter at the same time?
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Old 03-09-2015, 10:10 AM   #3
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No converter at this time. I was hoping I could do it with pulling the coverter.
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Old 03-09-2015, 10:29 AM   #4
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You won't be able to get all the fluid out unless you pull the converter. This is why they use machines at the dealer to flush everything through.

FYI when I did my converter I replaced almost all the fluid with Amsoil but there still was some left over in the lines and cooler. You'll never get it all out unless you use the machine to do it.
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Old 03-09-2015, 11:04 AM   #5
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Okay thanks grabber.
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Old 03-10-2015, 02:06 AM   #6
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I also am interested in doing this. The factory fluid is a synthetic I assume? Any harm in mixing them if I just drop the pan and replace that with amsoil?

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Old 03-10-2015, 04:43 AM   #7
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No harm at all. There will be 3-4 quarts in the converter/lines left over. The transmission oil pan gasket is also reusable. JPC has a nice dipstick kit now that makes checking the fluid much easier.
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Old 03-10-2015, 04:49 AM   #8
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You sure there's no drain plug on the converters? There's one on mine. Don't know about new cars tho
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Old 03-10-2015, 07:51 AM   #9
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No drains on the late model torque converters. And on the late model Mustangs, Ford uses a synthetic automatic transmission fluid. They call it "lifetime". Yea, right.

The good transmission shops can use a low pressure flushing system to remove all the fluid and replace it with new. I've been using a local AAMCO shop for 15 years doing just this. My 2011 Mustang had this service done twice; once at 32K, the second at 60K. It would have continued had I still owned it (sold it in my search for a Boss, or 2016 special edition model).

My 2007 F150 had 100K on it when I bought it used. Since I was unaware of its previous automatic tranmission maintenance, I took it to them. They did a free inspection, and gave it a green light for a flush. Most folks get weary on flushing high mileage transmissions that have never had service before, as they have read in the internet stories of a flush disloging crud in a transmission into the tiny spaces of the fluid plate. I have now driven the truck almost two thousand miles without a transmission issue, and the piece of mind I have knowing it has fresh fluid is well worth the $165.00 it costs me to do it.

If you want a complete fluid change, flushing is going to be your best bet, and doing it every 30 to 40K will be fine, with no adverse effects to the transmission in your case, since it is still considered "new".
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Old 03-10-2015, 08:17 AM   #10
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I'm wanted to do a complete flush on my 11 with 36k. But I want to replace it with amsoil ss atf.
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