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Hard 1-2 shift

This is a discussion on Hard 1-2 shift within the Automatic Transmission forums, part of the Drivetrain category; The TA is shifting hard from 1st to 2nd. I have no codes and it is not in limp mode. ...

  1. #1
    Member 79Firebird_99TA's Avatar
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    Black
    99 Trans Am

    Hard 1-2 shift

    The TA is shifting hard from 1st to 2nd. I have no codes and it is not in limp mode. This just started last week. Any ideas?

  2. #2
    Junior Member
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    Pewter
    2000 Z-28

    ttt

    ????

  3. #3
    Member performabuilt's Avatar
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    2000ss

    Broken or stuck accumulator or bad PCS would be my guess or possibly ball came through the plate

  4. #4
    Retired NOT tired SteveC's Avatar
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    SOM
    2001 Z28 (Sara)

    My 01 Z28 shifts very hard from 1st to 2nd, I have a billet 2-4 super servo, and a transgo shift kit #3 washer.

    If you have any of these components that could be why the shift is that hard.

    SteveC

  5. #5
    Member 79Firebird_99TA's Avatar
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    Well the thing is .....it never did until recently. I must say that I like it....but it's different.

  6. #6
    Senior Member slims00ls1z28's Avatar
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    2005 GTO M6 Black
    2000 Z28 A4 Red

    You'll like it until it fails. Get it checked out.

  7. #7
    "My 01 Z28 shifts very hard from 1st to 2nd, I have a billet 2-4 super servo, and a transgo shift kit #3 washer."\
    Take out all of the washers, I never use them in any of my Performance buildups. This should make a big difference. If the 2nd feed hole on the separator plate is larger than .093", that can cause hard 1-2 part throttle shifts. Start with taking out the washers, and see what happens.

  8. #8
    Retired NOT tired SteveC's Avatar
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    SOM
    2001 Z28 (Sara)

    Thumbs up

    Quote Originally Posted by Pro Built Automatics View Post
    "My 01 Z28 shifts very hard from 1st to 2nd, I have a billet 2-4 super servo, and a transgo shift kit #3 washer."\
    Take out all of the washers, I never use them in any of my Performance buildups. This should make a big difference. If the 2nd feed hole on the separator plate is larger than .093", that can cause hard 1-2 part throttle shifts. Start with taking out the washers, and see what happens.
    I actually like how the vehicle shifts, and have no problems with it. You are obviously far more experienced in the automatic transmission field than I will ever be.

    I had the transmission work done by a professional shop (Mike's) in Poway, and I trust that the work was done correctly. It was Mike's idea to swap the stock LS6 servo out for this unit.

    Thanks for the tip.

    SteveC

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