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Changing entire transmission!

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Old Jul 27, 2011 | 10:46 PM
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Default Changing entire transmission!

I'm having problems with my transmission and I'm not finding where is it. I've tried almost everything and now I'm thinking about buying a new one from GM and replacing it.
Is there another possibility beside this or some opinion against
Thanks,
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Old Jul 27, 2011 | 11:19 PM
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Get it rebuilt by Rodney at RPM. Best company around and it will be stronger and better than stock.

My RPM built T56 is approximately 8 years old now, no issues.

Dope
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Old Jul 28, 2011 | 08:59 AM
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Alex,

What year is your car, how many miles on it, auto or manual and what seems to be the problem?

I agree with Dope, rebuilding in place of new might be the better choice.
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Old Jul 28, 2011 | 02:31 PM
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Eric and Dope,
I live in Brazil and I have a Corvette C5 1998 automatic (convertible) with 14.000 miles.
Every time I accelerate a little bit more the transmission starts to fail. What I mean by "fail" is that the car only works in first and second gear. If you put in third gear it's just like when the transmission is on neutral. At first I was having a temperature problem with my transmission (by that time, the "check gauges" light jumped on my panel and also a warning - "high transmission temperature" - but now nothing happens, the transmission just stopped working well) but, ever since I've installed the Hipertech software the temperature it's OK. I've no idea what it's happening and once the gearbox stops working like it should the only way to get the car back to normal it's by taking it to the mechanical but he's not having luck with the car.

Thanks,
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Old Jul 28, 2011 | 03:50 PM
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I think it would be worthwhile to change fluid and filter, make sure the new filter is a good one, OEM AC Delco AND is vacuum tight before it is put on.

There have been some posts on transmission problems caused by defective filters.

Make sure your "mechanical" knows that the transmission has to be full, fluid running out the fill/ level hole with the fluid at 122 degrees F AND the engine idling after going through the various gear selections at idle.
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Old Jul 28, 2011 | 09:27 PM
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just got my Z06 back from dragon and they did a spec stage 3+ and new seals on the tranny and a harden teeth love the clutch you should all get one it grabs really hard
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Old Jul 28, 2011 | 10:37 PM
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Originally Posted by trevheff
just got my Z06 back from dragon and they did a spec stage 3+ and new seals on the tranny and a harden teeth love the clutch you should all get one it grabs really hard
Nice to know, but the OP is asking about his automatic transmission and issues he is having.
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Old Jul 28, 2011 | 11:46 PM
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Originally Posted by Alex16
Eric and Dope,
I live in Brazil and I have a Corvette C5 1998 automatic (convertible) with 14.000 miles.
Every time I accelerate a little bit more the transmission starts to fail. What I mean by "fail" is that the car only works in first and second gear. If you put in third gear it's just like when the transmission is on neutral. At first I was having a temperature problem with my transmission (by that time, the "check gauges" light jumped on my panel and also a warning - "high transmission temperature" - but now nothing happens, the transmission just stopped working well) but, ever since I've installed the Hipertech software the temperature it's OK. I've no idea what it's happening and once the gearbox stops working like it should the only way to get the car back to normal it's by taking it to the mechanical but he's not having luck with the car.

Thanks,
!4,000 Miles or 140, 000 miles?

Any power adders on the car like Heads & Cam or supercharger?

When exactly did you install the Hipertech program? Before or after the trans problem?
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Old Jul 29, 2011 | 08:52 AM
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My Corvette has 14 thousand miles.
No, I've never changed anything mechanical like a supercharger. The only think I did to increase power was the Hipertech software.
I was already having problems when I installed the Hipertech... I think it only helped me on the transmission temperature problem.
Don't you guys think that it's better if I buy a original one (transmission) right from GM besides buying one from other company?
Thanks,
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Old Jul 29, 2011 | 09:13 AM
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Originally Posted by Alex16
My Corvette has 14 thousand miles.
No, I've never changed anything mechanical like a supercharger. The only think I did to increase power was the Hipertech software.
I was already having problems when I installed the Hipertech... I think it only helped me on the transmission temperature problem.
Don't you guys think that it's better if I buy a original one (transmission) right from GM besides buying one from other company?
Thanks,
Alex, as Jim993 suggested, it would be well worth doing the fluid and filter change first to see if this corrects your problem. With the low miles on your car it should not be having this issue.

Are there any signs of the trans leaking oil?
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Old Jul 29, 2011 | 10:48 AM
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Default Corvette 1998

Originally Posted by Eric D
Alex, as Jim993 suggested, it would be well worth doing the fluid and filter change first to see if this corrects your problem. With the low miles on your car it should not be having this issue.

Are there any signs of the trans leaking oil?
I'm sorry, I forgot! I've changed the fluid, it's brand new! And my filter (if that it's the kind of filter that you are saying is the air filter...) it's the K&N (not the cold air intake, just the basic filter). If it's the oil filter I'm not sure but I'll check!
No, nothing! Once there was a fuel leak but it was fixed right at the time!
That's why I'm considering buying a new one, because I really don't know what it's wrong. Just like you said, it's a "new" car...
Thank's,
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Old Jul 29, 2011 | 12:03 PM
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Originally Posted by Alex16
I'm sorry, I forgot! I've changed the fluid, it's brand new! And my filter (if that it's the kind of filter that you are saying is the air filter...) it's the K&N (not the cold air intake, just the basic filter). If it's the oil filter I'm not sure but I'll check!
No, nothing! Once there was a fuel leak but it was fixed right at the time!
That's why I'm considering buying a new one, because I really don't know what it's wrong. Just like you said, it's a "new" car...
Thank's,
Was it slipping before you changed the fluid? Check the last sentence in post #5. Some mechanics will not know the engine needs to be running and at the proper temperature to get the correct fluid level.
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Old Jul 29, 2011 | 09:17 PM
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BigGun,
Yes, it was... When the problems started to happen the car was 100% original.
Actually I don't know if my mechanic knows that but I'll tell him!
That's gonna be the third time he will try to fix my transmission...that's why we are considering buying a new one. I want to enjoy my car! I can't wait anymore!!! =)
Thanks,
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Old Jul 29, 2011 | 09:55 PM
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Alex,

Are there any other mechanics that might be more familiar with General Motors auto transmissions? If not, I understand you wanting to put in a new transmission. If you do buy a new one, make sure your mechanic has a manual to explain how to replace the transmission. It is not the same as other cars. There is an adjustment that has to be made to the propshaft where it attaches to the flex plate at the back of the engine.

I hope you find the problem and can start to enjoy your Corvette..

Cheers!
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Old Jul 30, 2011 | 04:05 PM
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Originally Posted by Eric D
Alex,

Are there any other mechanics that might be more familiar with General Motors auto transmissions? If not, I understand you wanting to put in a new transmission. If you do buy a new one, make sure your mechanic has a manual to explain how to replace the transmission. It is not the same as other cars. There is an adjustment that has to be made to the propshaft where it attaches to the flex plate at the back of the engine.

I hope you find the problem and can start to enjoy your Corvette..

Cheers!
I don't think so...he only works with GM (Camaro and Corvette). Doesn't this manual come with the transmission?
Thank you for the valuable information about the adjustments!
Thanks,
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Old Jul 31, 2011 | 02:22 PM
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Originally Posted by Alex16
I don't think so...he only works with GM (Camaro and Corvette). Doesn't this manual come with the transmission?Thank you for the valuable information about the adjustments!
Thanks,
No, he (EricD) is referring to the factory shop manual set, which consists of two books that cover the various repair procedures for the car. There are factory manuals available for all cars, but they have to be purchased seperately.

Since you're living somewhare other than the US, and GM trained techs aren't plentiful, if you plan on keeping the car for a while, you may want to consider purchasing a set for your own use.


As a side note, there is a fluid filter located inside the automatic transmission, which filters the fluid while the car is running. Some "secondary brand" filters may have a fluid intake opening that isn't as big as the OE filter. This can starve the transmission for fliud, and cause operational problems.
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Old Aug 1, 2011 | 10:55 AM
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Originally Posted by leadfoot4
No, he (EricD) is referring to the factory shop manual set, which consists of two books that cover the various repair procedures for the car. There are factory manuals available for all cars, but they have to be purchased seperately.

Since you're living somewhare other than the US, and GM trained techs aren't plentiful, if you plan on keeping the car for a while, you may want to consider purchasing a set for your own use.


As a side note, there is a fluid filter located inside the automatic transmission, which filters the fluid while the car is running. Some "secondary brand" filters may have a fluid intake opening that isn't as big as the OE filter. This can starve the transmission for fliud, and cause operational problems.
Thank you very much! I'm gonna search where to buy this manual and pay more attention to this filter details! (because I don't know much about this OE filter that you are talking...)
About the car...I'm planning to keep this car for my hole life! =)
I love my Corvette. I never thought about selling it.
Thanks,
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Old Aug 2, 2011 | 07:21 AM
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Originally Posted by Alex16
Thank you very much! I'm gonna search where to buy this manual and pay more attention to this filter details! (because I don't know much about this OE filter that you are talking...)
About the car...I'm planning to keep this car for my hole life! =)
I love my Corvette. I never thought about selling it.
Thanks,
Alex, in an automatic transmission, the filter sits near the bottom of the transmission pan, completely submerged in transmission fluid. The tranny's internal pump draws this fluid upward through an opening in the bottom of the filter, through the filter, then routes it through the transmission's internal passages.

I was reading an article recently about a shop that did auto tranny upgrades, and they were showing the diference in the size of this opening in a cheap, generic, replacement filter, vs. the opening in a "name brand" filter, such as AC Delco, Wix, or Baldwin. Too small an opening, such as the "cheap" filter had, can starve the transmission during spirited driving. Also, because the filter needs be be submerged at all times, this is why its important to have the fluid at the correct level.

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Old Aug 3, 2011 | 09:33 PM
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Originally Posted by leadfoot4
Alex, in an automatic transmission, the filter sits near the bottom of the transmission pan, completely submerged in transmission fluid. The tranny's internal pump draws this fluid upward through an opening in the bottom of the filter, through the filter, then routes it through the transmission's internal passages.

I was reading an article recently about a shop that did auto tranny upgrades, and they were showing the diference in the size of this opening in a cheap, generic, replacement filter, vs. the opening in a "name brand" filter, such as AC Delco, Wix, or Baldwin. Too small an opening, such as the "cheap" filter had, can starve the transmission during spirited driving. Also, because the filter needs be be submerged at all times, this is why its important to have the fluid at the correct level.

OK!
I've already bought the new transmission and now I'm just waiting to get here in Brazil.
When the transmission arrives I'm gonna tell my mechanic about all this. I'm trying to find this manual on Google but I'm not having luck... I think I'm gonna have to buy a new one from the US.
Thank you for all this information... it has been very helpful!
Now I need to be patience and wait for it!
Thanks,
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Old Aug 4, 2011 | 08:38 AM
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Alex, to get a factory shop manual, go to HelmInc.com (Helm Publishing). They publish/sell the GM shop manuals, and should be able to get a set (3 books) to you.
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