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Is changing transmission fluid bad if the transmission needs a rebuild?
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freefallin
Novice
Sep 11, 2012, 5:40 PM
Post #1 of 11
(2122 views)
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Is changing transmission fluid bad if the transmission needs a rebuild?
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2003 chevy v6 with 125,000 miles on it.
The automatic transmission is shifting late! Like it would take a sec or 2 to shift to the next gear (only when driving).
If from stand still i floor the accelerator, the rpm would go all the way to 7,000 (which is the end), stay there for like a sec and then shift. Its not so prominent when driving normally but i can feel the delay nonetheless.
I heard it could be due to 2 things, either the fluid and filter needs to be changed or the transmission needs to be rebuild. But then i heard that if the transmission needs to be rebuild then changing the fluid will worsen the problem,therefore changing the filter and fluid is a bad idea IF the transmission is faulty. Is this true??
How can i be certain that the transmission needs to be rebuild?! The only symptom i have is a slightly delayed shifting (only when driving). I know another way is to check if the fluid is brownish or smells burnt. But the problem is the car was with someone else before me and i think he "added" fluid to it cz it was leaking...therefore the transmission fluid is clear and not burnt (clean).
Is there any other way to know if i really need a rebuild b4 i shell out mega bucks?!
And of course my first question... does changing fluid and filter really harm the transmission if it is faulty?
(This post was edited by freefallin on Sep 11, 2012, 6:04 PM)
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nickwarner
Veteran
/ Moderator
Sep 11, 2012, 6:10 PM
Post #2 of 11
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Re: Is changing transmission fluid bad if the transmission needs a rebuild?
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First thing first, get the codes pulled and post the exact numbers here. This could be an electrical issue. You may have a P1870 code. since Chevy doesn't make anything called a V6, it would be nice to know exactly what kind of vehicle we are talking about. If you have a trans which is slipping and change the fluid, its too late. Most fall on their face shortly thereafter and many never move again out of the bay the work was done in. Fluid doesn't fix shot parts. Post back with the info and we go from there to pin this down.
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nickwarner
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/ Moderator
Sep 11, 2012, 6:35 PM
Post #4 of 11
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Re: Is changing transmission fluid bad if the transmission needs a rebuild?
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None of those codes have anything to do with your trans. I would get the O2 sensor code fixed up real soon so you don't wreck your cats. The airbag is your choice. I personally dislike them and in my own vehicles they don't operate. I think its time to go to a transmission shop to get a diagnosis. They know what they are looking for and have the right tools to verify quickly what the issue is. Well worth the diagnostic fee.
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freefallin
Novice
Sep 11, 2012, 6:53 PM
Post #5 of 11
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Re: Is changing transmission fluid bad if the transmission needs a rebuild?
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Yeah, didnt post them cz i figured they had nothing to do with the transmission.
I took the car to a few workshops and after telling them what the car is doing, the default reply i get is "transmission rebuild"...alot without even checking the car at all.
So i figured it might be a problem that doesnt require a rebuild. I mean, does the symptom my transmission is displaying automatically mean it needs to be rebuild??
Im hoping to find someone on here (or anywhere else) that had a similar problem to know what they did to fix it.
Im also thinking it might just need a new filter since i heard a bad filter causes delayed shifting. But im sacred to change the filter and fluid cz i heard that could damage the transmission if it requires a rebuild.
Guess i need expert advice on all this! :l
(This post was edited by freefallin on Sep 11, 2012, 7:02 PM)
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nickwarner
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Sep 11, 2012, 9:18 PM
Post #7 of 11
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Re: Is changing transmission fluid bad if the transmission needs a rebuild?
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DS hit it on the head. Rev your motor like that and you'll need an engine along with the trans. I know you want to hear about a $20 solenoid or a magic additive in a can but the cold hard truth is your trans is junk. Fix the car or sell it at a loss.
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nickwarner
Veteran
/ Moderator
Sep 12, 2012, 1:50 PM
Post #10 of 11
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Re: Is changing transmission fluid bad if the transmission needs a rebuild?
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Actually, in my first post I told you that changing it when you already have a problem is bad. Then I told you that you need a new trans. If you don't know how to even diagnose the thing, you certainly don't have the knowledge and special tools to repair the broken internal components. But by all means expect me and DS to be mind readers and go ahead and shoot the messenger. Good luck with fixing the car.
Since you don't think you got the perfect answer, I'll make sure you get a full refund for the massive $0 it cost you to post here. Please allow 4-6 weeks for the check to arrive.
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Discretesignals
Ultimate Carjunky
/ Moderator
Sep 12, 2012, 4:28 PM
Post #11 of 11
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Re: Is changing transmission fluid bad if the transmission needs a rebuild?
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Ok, you have delayed shifting and taking the engine all the way up to 7 grand isn't going to help it. You need to get a high end scan tool to monitor the SS pids to see if the PCM is commanding a shift when the shift is delayed. If the engine is just winding up and your not accelerating, you probably have slippage going on. From there you would have to perform some pressure tests to validate the hydraulic pressures are within specifications.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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