Went to store-had overdrive, coming back-NO OVERDRIVE - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 05-26-2006, 02:03 AM   #11
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the overdrive in your car will engage for a short time then you will loose the drive and fall back to third. (speaking from personal exp.) As lakevillessei said it is a tcc solienoid failure. I don't think that changing the fluid will help. They will probably need to rebuild the trans . Sorry to be the man that brings the bad news but I am in the same boat.
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Old 05-26-2006, 03:27 AM   #12
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There'* a Sonnax kit available that replaces the chronically failing TCC solenoid bore and will fix the problem you are having. I had this done to my current transmission. It consists of a new bore sleeve for the torque converter clutch apply solenoid in the valve body, a new solenoid with a larger piston, and it works freakin' awesome.

What happens to cause this is the bore becomes oversized due to wear from the TCC solenoid piston and allows too much slippage to occur, which the PCM then sees and pulls it out of overdrive and into it'* fail-safe mode, 3rd gear. There is a way to force the car to run in overdrive without having complete lockup, but I suggest not using it because it will fry your transmission.

This repair can be done with the transmission in the car, but it is one that I will NEVER suggest that anybody without some transmission experience (beyond a filter and fluid change) attempt to tackle. It involves pulling the side cover and the valve body, drilling the bore out to a pre-determined size, installing the new bore sleeve, and reinstalling the valve body and all related solenoids.

Keep in mind that even if the transmission was rebuilt recently, that doesn't mean that they didn't reuse the valve body because no wear was detected at that time. It'* very possible (and very likely) that the bore was already showing signs of wear but not enough to cause any concern at the time of rebuild.
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Old 05-26-2006, 12:36 PM   #13
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Quote:
Originally Posted by CSFiend
There'* a Sonnax kit available that replaces the chronically failing TCC solenoid bore and will fix the problem you are having. I had this done to my current transmission. It consists of a new bore sleeve for the torque converter clutch apply solenoid in the valve body, a new solenoid with a larger piston, and it works freakin' awesome.

What happens to cause this is the bore becomes oversized due to wear from the TCC solenoid piston and allows too much slippage to occur, which the PCM then sees and pulls it out of overdrive and into it'* fail-safe mode, 3rd gear. There is a way to force the car to run in overdrive without having complete lockup, but I suggest not using it because it will fry your transmission.

This repair can be done with the transmission in the car, but it is one that I will NEVER suggest that anybody without some transmission experience (beyond a filter and fluid change) attempt to tackle. It involves pulling the side cover and the valve body, drilling the bore out to a pre-determined size, installing the new bore sleeve, and reinstalling the valve body and all related solenoids.

Keep in mind that even if the transmission was rebuilt recently, that doesn't mean that they didn't reuse the valve body because no wear was detected at that time. It'* very possible (and very likely) that the bore was already showing signs of wear but not enough to cause any concern at the time of rebuild.
Thank you so much. I am printing this out to give to my transmission shop. Thanks again


(I hope the trans guy doesn't take this personally) :P
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Old 06-01-2006, 10:44 PM   #14
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Hafrod, how many miles does your car have on it?
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