Transmission Flush or Change Fluid? - Ford Powerstroke Diesel Forum
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post #1 of 11 Old 03-15-2013, 08:45 AM Thread Starter
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Transmission Flush or Change Fluid?

My transmission is due for more fluid (it will occasionally upshift and shifting is rough) is and I was wondering how I should get it done, shall I have it flushed or should I just change the fluid? I have heard that flushing it causes the filter to get clogged and causes damage. Is that true?
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post #2 of 11 Old 03-15-2013, 01:04 PM Thread Starter
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Also I just called a local transmission shop and they said the fluid has nothing to do with the upshift and rough shifting! I've heard from many people that the way to fix it is new fluid. Who is right? The shop or the people I talk to?
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post #3 of 11 Old 03-27-2013, 02:32 AM
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I would take it to ford and have them do a heated flush.. It costs about $200 in my area and was worth it..

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post #4 of 11 Old 03-27-2013, 05:39 AM Thread Starter
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I would take it to ford and have them do a heated flush.. It costs about $200 in my area and was worth it..
Ok and will that fix slippage and rough shifting?
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post #5 of 11 Old 03-27-2013, 06:25 AM
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It might, and it might not. Depends on if your trans is healthy.

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post #6 of 11 Old 03-27-2013, 07:50 AM
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Quote:
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Ok and will that fix slippage and rough shifting?
Its a good place to start..Thats what I would do.

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post #7 of 11 Old 03-27-2013, 08:03 AM
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Do the flush and then change the in line trans filter. Passenger side by front bumper. It probably needs to be done anyways as a general maintenance procedure.

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post #8 of 11 Old 03-27-2013, 12:06 PM
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Do what BTS recommends..drop the pan, new filter and refill 8qts..every 30k.
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post #9 of 11 Old 03-31-2013, 06:03 PM
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I was wondering if you can clarify on what your trans is doing? Mine is acting up also. While driving, it will upshift for a half second then back down. Kinda like its slipping, but with a positive engagement. I changed the filters and replaced the 8qts it drained, today. Only had time to drive a few minutes, but it still did it. Time will tell I guess.

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post #10 of 11 Old 04-04-2013, 11:40 AM Thread Starter
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Thank you everyone!
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