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Old April 15th, 2013, 03:09 PM   #1
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Default Trans Fluid- To flush or not to flush?

After a weekend at the dunes my truck has started to have some transmission issues. Nothing major, but I noticed that it doesn't like to shift from 2nd to 3rd, doesn't slip, just shifts hard and if I really get on it it does seem to slip a little bit. Normal driving, it shifts just fine. I did check the fluid level and it is right in the middle of where it's supposed to be; the fluid is not pink/bright red but is a dark red, does not smell burnt though.

My questions, should I just change the 4 or so quarts like normal along with a new filter, have it completely flushed, or leave it along till it blows? Looking deeper into fluid changes, i've read that completely flushing a higher mileage transmission that hasn't a fluid change in the last 50k or so miles will cause more issues that it solves. I do not know when the last actual fluid change was, although I did have to have a park pin thingy replaced a few years ago, so i'd imagine it had completely new fluid put in when that was done when the valve body was removed.

I have never heard that completely flushing the fluid is bad, but then again i've only actually don't 3 or 4 transmission fluid changes. the rest was changing an actual transmission
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Old April 15th, 2013, 04:56 PM   #2
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how many miles on trans?
a flush is not going to fix worn parts/clutch packs. it usally makes it worse once you take all the shit out of the fluid.
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Old April 15th, 2013, 05:00 PM   #3
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Flushes are meant to be preventative. Like medicine they can prevent you from getting sick but they can NOT raise the dead.

If you have internal problems you may already be screwed, flushing may just speed up the decline but if that happens you would have had to rebuild it anyway.
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Old April 15th, 2013, 06:50 PM   #4
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I would change it and hope for the best. If the fluid is red and doesnt smell burnt then it's most likely not full of clutch material. I have seen filters come loose and also the rubber o ring aroumd them crack. If the filter did fall down or the oring cracked it will burn up in no time from lack of pressure.
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Old April 15th, 2013, 08:27 PM   #5
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I don't mean to hack your thread wave

But I have been wondering the same thing nothing is wrong with my trans but I have always herd if its never been changed don't touch it

My truck has 285,000 miles on it and I'm not sure if the trans has ever been touched
Shifts fine just was wondering
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Old April 16th, 2013, 07:32 AM   #6
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Originally Posted by muddinman56 View Post
I don't mean to hack your thread wave

But I have been wondering the same thing nothing is wrong with my trans but I have always herd if its never been changed don't touch it

My truck has 285,000 miles on it and I'm not sure if the trans has ever been touched
Shifts fine just was wondering
I would change it but not flush it. Flushing can stir up all those nooks and crannies that has been storing clutch pack material sludge and could possibly get jammed up in your valve body or other areas.
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Old April 16th, 2013, 08:29 AM   #7
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Originally Posted by Bleay View Post
Flushes are meant to be preventative. Like medicine they can prevent you from getting sick but they can NOT raise the dead.

If you have internal problems you may already be screwed, flushing may just speed up the decline but if that happens you would have had to rebuild it anyway.
I know it won't fix a broken trans, but it may not be the trans itself, just the fluid. Or it is the transmission. From how it wad acting is what leads me to say it needs new fluid. I may be wrong, but when the valve body wad dropped that let all, or the majority of the fluid out right? So I shouldn't have to worry about clutch material so much; that work wad done about 27k miles ago. Its been beat on a little bit since then, a few half hammered drives through a buddies farm field, snow wheeling and then silver lake this past weekend. I never really beat the piss out of it, no redlining that is
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Old April 16th, 2013, 08:37 AM   #8
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Quote:
Originally Posted by wave_crusher View Post
I know it won't fix a broken trans, but it may not be the trans itself, just the fluid. Or it is the transmission. From how it wad acting is what leads me to say it needs new fluid. I may be wrong, but when the valve body wad dropped that let all, or the majority of the fluid out right? So I shouldn't have to worry about clutch material so much; that work wad done about 27k miles ago. Its been beat on a little bit since then, a few half hammered drives through a buddies farm field, snow wheeling and then silver lake this past weekend. I never really beat the piss out of it, no redlining that is
You would have still had several quarts in the torque converter, Trans lines, and cooler when dropping the valve body.

Here's the problem with mechanical parts: you can not see inside of them so it's all just a guess until you tear it down and inspect things.

You have a problem with your Trans, if you feel it is bad enough to warrant repair you may as well try the least expensive option first(flushing). If that doesn't fix it or makes it worse, you needed a Trans rebuild anyway.
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Old April 16th, 2013, 11:02 AM   #9
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Originally Posted by Bleay View Post
You would have still had several quarts in the torque converter, Trans lines, and cooler when dropping the valve body.

Here's the problem with mechanical parts: you can not see inside of them so it's all just a guess until you tear it down and inspect things.

You have a problem with your Trans, if you feel it is bad enough to warrant repair you may as well try the least expensive option first(flushing). If that doesn't fix it or makes it worse, you needed a Trans rebuild anyway.
That was my thinking, I know the parts are worn, there's 183k miles on the truck, and i'm sure the transmission has never been changed. I do not know what was done, if anything to the transmission before I got the truck, but it was used for driving around the state, and there was regular maintenance done. It still had the receipts in the glove box for oil changes and such.

I believe I will just go with a regular fluid change and a new filter, and see if that helps at all. I'm sure I will need a rebuild in the next year or two, but at least for now i'll try and prolong that
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