Question about Chevrolet Corvette

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1986 corvette 700R4 transmission will not down shift from overdrive to third during hard acceleration. Transmission recently rebuilt new throttle valve, TV cable working and adjusted properly. Help?

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  • corvetteman Nov 26, 2008

    I have a similar problem on an 87 Corvette, only mine doesn't do it until the transmission reaches a certain temperature threshhold. At whatever that magic number is, the trans bogs the motor down, in ANY gear. Once I get the trans temp down it is fine.

  • Anonymous Mar 13, 2014

    trans will not shift into overdrive after slowing to a stopn then accelerating again

  • Anonymous Mar 23, 2014

    Hard to shift, H pattern distorted,hard to find neutral

  • Anonymous Mar 23, 2014

    overdrive sensor needs adjusted when shifts into overdrive it revs up and slows down

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Are you sure the TV ( trans shift cable at the throttle valve) cable is correctly adjusted?? Without line pressure readings, I can only guess that the D3/Part throttle check ball is missing, if it is a trans problem
If the TV is correct, I am assuming that the TV cable is pulled tight at WOT.
Did you check the throttle (ACCEL) cable to be sure that the carb goes wide open when your accel pedal is on the floor?? This must be done with someone in the car and a second person looking at the carb. Without doing this, you do not know if you have WOT. Without WOT, the trans will not de-tent and shift down.

Posted on Jul 29, 2008

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