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Old 05-24-2010, 09:58 AM
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Transmission Flush - Good or Bad?

I copied this from another forum and thought this might be some useful information

"Transmission Flushing - Good or bad?

Never, ever flush a transmission. There is no "safe" way to flush a transmission unless you own the flush machine and control it yourself.

Flushing a transmission has several pitfalls...

The most obvious is that the last vehicle hooked up to that flushing machine probably was on it's last leg and was generating tons of debris. Most owners, when the transmission starts to act up, rush to get a "flush" in the fervent hope that it will cure the problem. So... flush machines, by definition, see the worst of the worst. If the lines aren't cleaned, hooked up improperly, oil is reused or recycled, etc....then you are screwed as your transmission gets the dose of debris from the last transmission . No matter how good the intentions of the shop, one simple mistake and your transmission gets the debris.

Flushing is supposed to negate the need for removing the pan, cleaning the debris and replacing the filter... BS. There is considerable debris coating the inside of the transmission pan with miles as anyone who has done this can attest. That is part of the maintenance, removing the pan, cleaning the screens and replacing the filter and cleaning the pan.

All that debris in the pan is laying around in areas where there is little oil flow by definition... it tends to settle in the areas where the oil is quiet and just lies there not hurting anything.... until the "flush" stirs it up and circulates it thru the transmission. What a concept...


Reverse flush????? What logic makes anyone think that it is a good idea to reverse the oil flow path in a reverse flush and flush sediment and debris into areas that are normally protected by filters, etc...???? Stupid idea. Period. No other way to describe it.

"Transmission flush" machines are money makers for the shops and dealerships because they are quick and easy and they can actually charge more money for it under the guise of it being "better" for the transmission... when it is really a detriment.... suckers are born every day...

Read the factory service manuals and point out the place where a transmission "flush" is recommended.

So what if all the oil cannot be removed. A "flush" doesn't remove it all either.

If you really really want to replace as much oil as possible in the transmission, drain the pan, service it by removing/cleaning/changing the filter and reassemble. Refill the transmission with fresh fluid. Disconnect one of the cooler lines at the radiator, put it into a bucket and start the engine. Let the transmission oil pump purge the old oil into the bucket so that nothing is subjected to abnormal oil flow. Start pouring oil into the transmission to keep it full while the idling engine/transmission oil pump purges the fluid thru the system. Easy and quick and gets ALL the fluid out... and eliminates any risk of hooking up to a "flush machine".


FORGET THE IDEA OF FLUSHING YOUR TRANSMISSIONS. Normal transmission maintenance is a good idea. Drop the bottom pan, change the filter and clean everything up and refill the transmission with fresh fluid. Do the cooler line/bucket purge if you are really fastidious about changing all the fluid... but... DO NOT hook your transmission up to a flush machine.

Really now, would you get a blood transfusion from an unknown source that is reusing needles... about the same thing if you think about it. A flush will do absolutely nothing more than a good drain and refill will accomplish... and potentially a lot of harm. Do not take the risk. Just because some have had good experiences (or the lack of a bad experience) with a flush does NOT mean that they will always go good."

Like this article states HELL NO TO FLUSH
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Old 05-24-2010, 10:00 AM
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Re: Transmission Flush - Goor or Bad?

Hell no to a flush. Many vehicles have been hooked up to that machine like this article said and the shit is dirty.

Drop the pan and change the fluid.

IMO.
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Old 05-24-2010, 10:02 AM
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Re: Transmission Flush - Goor or Bad?

Quote:
Originally Posted by Robert Palmer View Post
Hell no to a flush. Many vehicles have been hooked up to that machine like this article said and the shit is dirty.

Drop the pan and change the fluid.

IMO.
X2
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Old 05-24-2010, 10:03 AM
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Re: Transmission Flush - Goor or Bad?

Quote:
Originally Posted by Robert Palmer View Post
Hell no to a flush. Many vehicles have been hooked up to that machine like this article said and the shit is dirty.

Drop the pan and change the fluid.

IMO.
I was trying to be sarcastic with the title LOL

oh and please change the title of the thread from goor to good
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Old 05-24-2010, 10:06 AM
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Re: Transmission Flush - Goor or Bad?

Quote:
Originally Posted by boniomario View Post
i was trying to be sarcastic with the title lol

oh and please change the title of the thread from goor to good :d
x2 lol
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Old 05-24-2010, 01:40 PM
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Re: Transmission Flush - Good or Bad?

Yeah, I was going to get mine flushed rather than just changed as I thought it would be better...

After I read up on it I realised that was pretty much the opposite! Needless to say I just got the fluid and filter changed.
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Old 05-24-2010, 08:03 PM
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Re: Transmission Flush - Good or Bad?

I know this is a dumb question but do you notice any difference right away after you changed the filters ???
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Old 05-26-2010, 02:55 PM
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Re: Transmission Flush - Good or Bad?

Err,, slightly.

Noticed the shifts were no where near as smooth and it seemed to hesitate a little.. I checked the fluid a few days later and found the idiots at the dealer didn't put enough in.

Went back, topped off and it was the same as before.

My fluid was still bright red and smelt sweet which meant it was fine but I though what the heck, since it could have been many years old.
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Old 05-26-2010, 06:17 PM
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Re: Transmission Flush - Good or Bad?

Yeah, I am always weary of 'flushing', whether it be tranny, engine, or whatever, for fear of dislodging some sludge into another place. There are so many orifices, check balls and paths in the valve body of an automatic transmission, anything can get lodged in there and cause more issues.

Besides, changing the fluid without the filter is fail, *unless* you change it then change it again in a 100 miles let's say; remember that a good portion of the fluid is in the converter and elsewhere that will not come out in a single draining; that would be the *only* reason why a machine flush may be beneficial if you were to run it for some time.
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Old 05-26-2010, 06:43 PM
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Re: Transmission Flush - Good or Bad?

Chrysler no longer recommends this "service" be offered by their certified dealers. It was published somewhere here as a copy of a memo from Chrysler to its dealers regarding customer satisfaction.

WK 545RFE xmissions have 2 filters. The '08 OEM WK Service Manual doesn't call for a transmission fluid change for 100,000 miles in normal service. Sometimes you can do more damage by trying to help......
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Old 05-26-2010, 07:21 PM
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Re: Transmission Flush - Good or Bad?

Quote:
Originally Posted by boniomario View Post
Like this article states HELL NO TO FLUSH
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 05-26-2010, 10:05 PM
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Re: Transmission Flush - Good or Bad?

If you do drop the pan you will probably want to tap a drain in it as there is none on the 545RFE.

Never do a flush for the reasons stated!
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