C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

700R4 Overdrive Problem????

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Old Nov 25, 2004 | 07:29 PM
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Default 700R4 Overdrive Problem????

Hi,

The 700R4 in my 88 coupe is not working properly. It is having a hard time kicking into overdrive. Normally, when I put it into overdrive, even at low speeds, it kicks right in. Now, OD and D work as if there is no difference.

When it gets into overdrive at low speeds, the RPM's drop like they are suposed to. However, the engine will rev like its in neutral up until it reaches the RPM where Drive usally would be, and then the car accelerates.

Could there be a solenoid that is not locking up the converter? Is the torque converter itself the probem?????

George
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Old Nov 25, 2004 | 07:33 PM
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have you adjusted the TV cable?
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Old Nov 27, 2004 | 06:02 PM
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Ihave not adjusted the TV cable. In fact, I wouldnt know how to do that. Can you give me any pointers?

Thanks....
George
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Old Nov 27, 2004 | 07:29 PM
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Originally Posted by GeorgeL98
Ihave not adjusted the TV cable. In fact, I wouldnt know how to do that. Can you give me any pointers?

Thanks....
George
this might help adjusting tv cable 101
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Old Nov 27, 2004 | 07:50 PM
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Unless the TV cable broke or something to cause it to adjust it self, I can't see that being the problem. Have "Stomped" on it recently? That couls cause it to do that.

Have you checked the fluid? It really needs to be on the mark at operating temp.
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Old Nov 27, 2004 | 08:17 PM
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Originally Posted by GeorgeL98
Hi,

It is having a hard time kicking into overdrive. Normally, when I put it into overdrive, even at low speeds, it kicks right in. Now, OD and D work as if there is no difference.

When it gets into overdrive at low speeds, the RPM's drop like they are suposed to.
The way you have written this, is confusing to me. Overdrive isn't supposed to engage at low speeds, or merely by moving the lever fron D to OD. Part of THAT depends on what you are referring to as "low speeds". Corvette automatics are 4 speed transmissions, with third gear direct, and fourth overdrive. It isn't like the 4+3 manual trans where the OD can be engaged on top of 2nd, 3rd, and 4th. First, the trans has to run through the first three gears, and then, fourth gear (OD) can be engaged. Are you confusing OD with coverter lock up? Or is your writing just not clear?

RACE ON!!!
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