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trans fluid change questions

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Old 05-05-2014, 02:40 PM
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I will be doing this this weekend,

https://sites.google.com/site/fordf1...nge-procedures

Seems like it will have the upsides of a full flush without the apparent downsides.
Old 05-05-2014, 02:45 PM
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Originally Posted by Especial86

I'm sorry but this is false.. Not changing the fluid is a terrible idea. The fluid does break down overtime. It gets diluted with contaminants in suspension, decreases lubricity, does not cool as efficiently and causes hang ups in solenoid function and blockages throughout the system, and valve body.. I see no benefits to leaving old worn fluid in any transmission or transfer case. The myth that a tranny is being "held together" by contaminated fluid is absolutely just a myth. The reality is that most people tend to wait for the issues to start popping up, and then they decide to change the fluid. In many cases failure can be prevented from fresh fluid changes alone.....
Don't wait for the warning signs, always change your fluid at least every 30,000 miles... If you follow the info in the thread I linked, you will see its likely the safest way to cleans a Trans, and restore cooling and flow efficiency.. Power flushing is NOT RECOMMENDED AT ALL..
The topic wasn't changing at normal service intervals here, I agree with routine fluid maintenance changes. But with a trans at 235K mikes and fluid never been changed, I think you can open up a can of worms.
Old 05-05-2014, 02:47 PM
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Originally Posted by techrep
if your fluid is dark brown or smells burnt, its probably not a good idea to change it. Wow...
Would you like to chime in then?
Old 05-05-2014, 03:11 PM
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Originally Posted by GraveDigger85
The topic wasn't changing at normal service intervals here, I agree with routine fluid maintenance changes. But with a trans at 235K mikes and fluid never been changed, I think you can open up a can of worms.
Like I said earlier, if he's not having issues already, then I would not wait for the inevitable issues from lack of service to develop. I would change it.

But yes if you expect a miracle cure from an already malfunctioning Trans after a fluid change, then your dreaming.

BTW: my fluid was also brown when I first changed it in the ballpark figure of 25k miles ago.. I'm now at 165k with no issues and a great performing tranny...
Old 05-05-2014, 07:20 PM
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Originally Posted by GraveDigger85
Would you like to chime in then?
I really doubt that the tranny made it to 235 K without ever being serviced.
Old 05-05-2014, 08:45 PM
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thanks for all the input everyone i appreciate it i think my plan is to slowly dilute the old fluid with new fluid by changing the fluid, not flush, about every 5-10k miles, so again thanks everyone
Old 05-05-2014, 08:57 PM
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Originally Posted by techrep

I really doubt that the tranny made it to 235 K without ever being serviced.
According to the original poster and the next guy they both agreed that they haven't had their transmissions serviced ever. So I do make a valid statement about fluid changing if it had been that long. It's unmasking potential problems not always creating new ones. And yes if the fluid is dark brown and burnt then the transmission fluid is cooked, the transmission internals could be cooked and potentially the transmission cooler should be looked at as well. Which is why I stated you could be opening a can of worms by changing fluid if its beyond that point. I don't neglect fluid maintenance one bit but if it hasn't been serviced in that long of time or mileage, why start now.
Old 05-05-2014, 10:57 PM
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Originally Posted by GraveDigger85
According to the original poster and the next guy they both agreed that they haven't had their transmissions serviced ever. So I do make a valid statement about fluid changing if it had been that long. It's unmasking potential problems not always creating new ones. And yes if the fluid is dark brown and burnt then the transmission fluid is cooked, the transmission internals could be cooked and potentially the transmission cooler should be looked at as well. Which is why I stated you could be opening a can of worms by changing fluid if its beyond that point. I don't neglect fluid maintenance one bit but if it hasn't been serviced in that long of time or mileage, why start now.
I hear where your coming from, and in some respect your right. The "opening a can of worms" theory is certainly real. I just don't think "neglect" is going to do anything to prevent that can of words from finally opening. I've seen the can of worms theory in action, where 1 thing after another keeps needing maintenance. But IMHO the transmission itself IS just 1 of those things, among many others.. You would never use the same train of thought on your motor with regards to oil, so what makes the transmission so different? They are both functioning devices with multiple moving parts contending with friction, actuation, heat, flow, pressure, contamination and wear.......... So I really don't understand how anyone can realistically say changing the fluid is "dicey". If you ask me, not changing fluid is rolling the dice (risky), where changing the fluid is clearly being safe...

Last edited by Especial86; 05-05-2014 at 10:59 PM.
Old 05-05-2014, 11:12 PM
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They designed these transmissions to be serviceable for a reason. If it wasn't a good idea to change the fluid, they would have sealed the transmission from the factory.
Old 05-06-2014, 12:06 AM
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Originally Posted by muddyford911
They designed these transmissions to be serviceable for a reason. If it wasn't a good idea to change the fluid, they would have sealed the transmission from the factory.
Again, this wasn't a topic question of performing routine maintenance. The original poster asked if it would be a good idea to change his fluid out when it had over 100K miles on the transmission, and the second guy hasn't changed fluid in over 200K miles, something of which should have been done a long time ago, many times over by this point.


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