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  • LT4 -  1st to 4th Gear Shift Fix
  • LT4 -  1st to 4th Gear Shift Fix
  • LT4 -  1st to 4th Gear Shift Fix
  • LT4 -  1st to 4th Gear Shift Fix

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  1. #1
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    Default LT4 - 1st to 4th Gear Shift Fix

    I already have a '96 LT4 coupe, but will be purchasing a vert (10,000mi) that has the factory original shift setting for "emissions"-what a joke. My coupe has the fix & works beautifully.

    What is the procedure to eliminate this 1st to 4th shift sequence, so it can shift to 2nd without any restriction? I've heard terms before like a "jumper relay", but how do you do it? I believe some C5s also had this "problem."

    THANKS!

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    Simple fix Corvette Central $ 17.50 plugs in the line no tools even comes with a plastic tie. Mine has it works great

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    Quote Originally Posted by wingnut96lt4 View Post
    Simple fix Corvette Central $ 17.50 plugs in the line no tools even comes with a plastic tie. Mine has it works great



    Thanks wingnut! I will check it out.


  4. #4
    Member 96gs917's Avatar
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    Even simpler fix, just un-plug it.

  5. #5
    LT4 -  1st to 4th Gear Shift Fix BigJimZ16's Avatar
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    Quote Originally Posted by 96gs917 View Post
    Even simpler fix, just un-plug it.
    Just unplugging it will set a code, it will think the solenoid coil is open. The Eliminator Kits have a resistor that mimics the coil resistance, fooling the controller.
    The only thing that you accomplish when you make something idiotproof, is breed a better grade of idiot,

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    Three ways you can disable skip shift:

    1) On 89-95, just unplug the skip shift solenoid on the side of the trans
    2) On 96-13, install a skip shift eliminator, available from CAC sponsor Zip Products and other aftermarket sources.
    3) on 89-13 get an aftermarket calibration which has the skip shift function disabled.

    Also, you can avoid skip shift without spending any money if you learn to drive though it. Most people who get skip shift regularly, are very easy drivers (like they have a goldfish bowl on the seat) and always short shift out of first. That's really not the way to drive a Corvette. If you accelerate just a tiny bit more aggressively and hold the 1-2 shift a little longer, like a sports car should be driven; you'll reduce the number of skip shift intrusions to almost nothing.

    On the three Vettes I have with that feature, only one, a 95, has it disabled in the calibration and I really didn't ask for it to be done, the guy just did it. The other two, an '04 and a '12, have skip shift functional but it rarely enables. If it does, no biggie, I just shift to fourth. If I'm driving in a manner that allows skip shift to enable, the extra gas mileage won't hurt.

    Lastly, a little history...skip shift has nothing to do with exhaust emissions. It was developed for the late C4 six-speed as a way to gain fuel economy and meet the CAFE standards of the day. It's still used mainly for that reason on Corvette and other V8 cars with manuals. A secondary benefit was that it allowed the Corvette to meet the pass-by noise standard in California and other states which observe that standard. Up until the advent of the C6 dual-mode exhaust, that was another important reason for skip shift. In short, the test required the car to start out in first, shift to the next highest gear then accelerate at WOT past the microphones. A smart Corvette engineer bamboozled the California Highway Patrol into accepting the idea that since skip shift made fourth the next highest gear, they could pass by the mics at WOT, low rpm in fourth rather than high-rpm in second.

    Pretty sharp thinking if you ask me.

    I appreciate the much-maligned skip shift because it's allowed us to have high-performance Corvettes without guzzler (well...other than C6 ZR-1s) and to have less restrictive exhausts.

  7. #7
    Member 96gs917's Avatar
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    Just unplugging it will set a code, it will think the solenoid coil is open. The Eliminator Kits have a resistor that mimics the coil resistance, fooling the controller.
    I have had both cars unplugged, the green car since 1999, and have never set a code.

    I do agree with Hib, the easiest way, without unplugging anything, is drive the car a little more agressively. You really only have to get the car to about 20 MPH in first to be able
    to shift to second.

  8. #8
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    Quote Originally Posted by Hib Halverson View Post
    Three ways you can disable skip shift:

    1) On 89-95, just unplug the skip shift solenoid on the side of the trans
    2) On 96-13, install a skip shift eliminator, available from CAC sponsor Zip Products and other aftermarket sources.
    3) on 89-13 get an aftermarket calibration which has the skip shift function disabled.

    Also, you can avoid skip shift without spending any money if you learn to drive though it. Most people who get skip shift regularly, are very easy drivers (like they have a goldfish bowl on the seat) and always short shift out of first. That's really not the way to drive a Corvette. If you accelerate just a tiny bit more aggressively and hold the 1-2 shift a little longer, like a sports car should be driven; you'll reduce the number of skip shift intrusions to almost nothing.

    On the three Vettes I have with that feature, only one, a 95, has it disabled in the calibration and I really didn't ask for it to be done, the guy just did it. The other two, an '04 and a '12, have skip shift functional but it rarely enables. If it does, no biggie, I just shift to fourth. If I'm driving in a manner that allows skip shift to enable, the extra gas mileage won't hurt.

    Lastly, a little history...skip shift has nothing to do with exhaust emissions. It was developed for the late C4 six-speed as a way to gain fuel economy and meet the CAFE standards of the day. It's still used mainly for that reason on Corvette and other V8 cars with manuals. A secondary benefit was that it allowed the Corvette to meet the pass-by noise standard in California and other states which observe that standard. Up until the advent of the C6 dual-mode exhaust, that was another important reason for skip shift. In short, the test required the car to start out in first, shift to the next highest gear then accelerate at WOT past the microphones. A smart Corvette engineer bamboozled the California Highway Patrol into accepting the idea that since skip shift made fourth the next highest gear, they could pass by the mics at WOT, low rpm in fourth rather than high-rpm in second.

    Pretty sharp thinking if you ask me.

    I appreciate the much-maligned skip shift because it's allowed us to have high-performance Corvettes without guzzler (well...other than C6 ZR-1s) and to have less restrictive exhausts.






    First, want to thank all of you for the information & advice. I'm a reasonably aggressive driver, so going past 20 in 1st isn't a problem. BUT, just in case, where is the connection to insert the skip eliminator?

    Thanks!



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    It is on the side of the transmission. Can't miss it. Kit comes with two sided plug and little plastic tie very easy and you get No Codes

  10. #10
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    Quote Originally Posted by wingnut96lt4 View Post
    It is on the side of the transmission. Can't miss it. Kit comes with two sided plug and little plastic tie very easy and you get No Codes

    Thanks wingnut. Will take a look on my current '96. Appreciate your help!


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    You'll probably find that the "one-to-four" light still comes on even though skip shift is disabled.

  12. #12
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    Quote Originally Posted by Hib Halverson View Post
    You'll probably find that the "one-to-four" light still comes on even though skip shift is disabled.
    Yes, that light still comes on in the car I have now. Thanks for all the insights.

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    If the light comes on something is not right It is grounding out check an see if a wire is bare

  14. #14
    LT4 -  1st to 4th Gear Shift Fix BigJimZ16's Avatar
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    Quote Originally Posted by wingnut96lt4 View Post
    If the light comes on something is not right It is grounding out check an see if a wire is bare

    BS... The light WILL come on telling you to shift 1-4. It doesn't know that 2-3 is available to you...
    The only thing that you accomplish when you make something idiotproof, is breed a better grade of idiot,

  15. #15
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    Quote Originally Posted by wingnut96lt4 View Post
    If the light comes on something is not right It is grounding out check an see if a wire is bare


    Thanks, I'll check it out.

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