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  #1  
Old 10-03-2013, 06:05 PM
1999ram318 1999ram318 is offline
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Default Tranny Fluid Change or Flush?

My truck has 142,xxx on it. Its a 99 ram with a auto transmission. The fluid doesnt look the best and the tranny overheated on me a week ago. Planning on flushing the tranny this weekend but ive heard flushing can loosen old stuff and create more problems. Any suggestions or tips? Thanks
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Old 10-03-2013, 07:24 PM
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I've always been told a flush is the way to go.

Some say while it does remove all the old fluid, it induces present dirt into delicate areas thru the flush process.

A change does not pull all the old, existing fluid so it's only a partial replenishment.

A flush with zero chemical additives is my preferred method.
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  #3  
Old 10-03-2013, 07:26 PM
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Oh, are you having any slippage?
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Old 10-03-2013, 07:46 PM
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Quote:
Originally Posted by Grubrunner View Post
Oh, are you having any slippage?
That's what I was going to ask. If you're having shifting problems or slipping...you'd be amazed at how many transmissions come into a scrap yard with crystal clear fluid and the trans is shot.

It usually happens when someone is experiencing problems and has a flush, service, and filter. Then it gets worse and they scrap the vehicle because in their opinion it's too much expense to put in a new/rebuilt trans than the vehicle is worth.

So...if you're having problems with the truck I'd stay away from the flush.

Just my opinion.
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Old 10-03-2013, 07:53 PM
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This is my personal opinion on this but if you overhead anything then it is only a matter of time before you will need to replace it.

I push this thought even further for transmission because they operate with frictions and clutch packs.
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Old 10-07-2013, 02:53 PM
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Quote:
Originally Posted by Grubrunner View Post
I've always been told a flush is the way to go.

Some say while it does remove all the old fluid, it induces present dirt into delicate areas thru the flush process.

A change does not pull all the old, existing fluid so it's only a partial replenishment.

A flush with zero chemical additives is my preferred method.
Flushing it the way the fluid is supposed to flow is a good way to clean the trans, but IMO if you change the fluid and filter and use premium fluid at 15K you will never need a flush...

Most flushes run backwards through the system, so they can be harmful in putting stuff where it isn't supposed to go.

for me I just used to change it frequently with good stuff and never needed a flush.
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Old 10-07-2013, 03:27 PM
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I wouldn't flush it. These transmissions are pretty weak and prone to go out anyway. You don't want to disturb them too much by getting debris/clutch material in places where they weren't before.

Just do a fluid and filter change.
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Old 10-07-2013, 05:18 PM
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Quote:
Originally Posted by beginningjockey View Post
Flushing it the way the fluid is supposed to flow is a good way to clean the trans, but IMO if you change the fluid and filter and use premium fluid at 15K you will never need a flush...

Most flushes run backwards through the system, so they can be harmful in putting stuff where it isn't supposed to go.

for me I just used to change it frequently with good stuff and never needed a flush.
Curious to know, do you also change the filters at that interval?
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  #9  
Old 10-07-2013, 07:12 PM
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Quote:
Originally Posted by Hermes1 View Post
Curious to know, do you also change the filters at that interval?
at every 15,000 miles or every 3 engine oil changes (whichever comes first) on every automatic I own I change the fluid and filter, and if applicable adjust the bands/cables/position sensor.

Only after I burned out a transmission did I learn about that. I changed fluid at every 25,000 miles approx.

Put it this way:

One of my friends has a Ford 1 ton truck, he's changed the fluid and filter and adjusted the manual lever position sensor every 15,000 miles.

It's a entirely stock transmision, never been flushed, it has over 1.5 million miles on it, never been rebuilt, still doesn't need it.

He tows heavy loads regularly with it, and it's his daily driver.

He has no reason to lie about it either.

The same goes for the Dodge transmissions, Chevy transmissions, any automatic. Keep it cool and give it plenty of clean fluid, and it'll last forever (almost lol).

People complain about these Dodge transmissions failing all the time. While they could have been built better, both me and many other transmission shops noticed one thing: Changing the fluid at the factory recommended interval is usually NOT frequent enough to keep the fluid clean. Even if that fluid smells fine and looks fine, it's got lots of stuff in it you need to get rid of, and the chemicals in the fluid don't last forever either. Electronically controlled trannys depend alot more on the chemicals in the fluid than most people realize.

That stuff causes sensors on our electronically controlled transmissions to read improperly, and it also clogs/limits the proper operation of the governor. Essentially this causes the transmission to run out of spec and causes excess slipping and poor operation which adds more deposits and builds up heat leading to premature failure.

Then it's only a matter of time til it will fail...

Any rate I don't want to derail this thread...
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  #10  
Old 10-07-2013, 08:21 PM
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if you do a Flush on an older transmission
little bits of debris & dirt can get into the Valve body
in the valve body, there are ports, the ports have either a ball bearing or cylinder with a spring that holds that in place while in certain gears & allow them to open when in other gears. If dirt gets into the ports, then the ball bearing can't close the port correctly & you get strange shifting operations
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