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transmission synchros

This is a discussion on transmission synchros within the Manual Transmission forums, part of the Drivetrain category; Can anybody describe what the transmission synchros feel like when they go out when you shift? For the last yr ...

  1. #1
    Spaz is My Mentor SMWS6TA's Avatar
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    transmission synchros

    Can anybody describe what the transmission synchros feel like when they go out when you shift?


    For the last yr , I've been having issues shifting from 2nd to 3rd. Thought it was the clutch and have installed as of last Sat - LS7 Clutch kit, QT Bell housing, New Master and Slave, New hydraulic Clutch line. I'm still having the same issue.

    I am thinking it might be the synchros but I'm not sure.

    Help?

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    Moderator Cutlass's Avatar
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    Bad synchros cause a grind noise when shifting into gear

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    Member Darkrider02's Avatar
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    Yea I have the same prob but the prob come n goes? What should I do took it to a mechanic n he drove it n said the tranny feels fine might be the bearings?

  4. #4
    Spaz is My Mentor SMWS6TA's Avatar
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    It only grinds when I do a quick/hard shift. If I shift normal/easy nothing, but if I get to banging gears I grind them easy. Driving me nuts...

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    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by Cutlass View Post
    Bad synchros cause a grind noise when shifting into gear
    Quote Originally Posted by SMWS6TA View Post
    It only grinds when I do a quick/hard shift. If I shift normal/easy nothing, but if I get to banging gears I grind them easy. Driving me nuts...
    it is best smws6ta to really understand what the synchros do..then it all makes perfect sense why it is doing it.

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    Member Darkrider02's Avatar
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    for me it happens on occasions as well as hard downshifts!!!!!

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    Senior Member rajiv1998's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Can anybody describe what the transmission synchros feel like when they go out when you shift?


    For the last yr , I've been having issues shifting from 2nd to 3rd. Thought it was the clutch and have installed as of last Sat - LS7 Clutch kit, QT Bell housing, New Master and Slave, New hydraulic Clutch line. I'm still having the same issue.

    I am thinking it might be the synchros but I'm not sure.

    Help?
    Yup its the synchros. Had the same problem and it turned out to be the synchros.
    "Life is to short to drive a slow car"

    Gone but not forgoten: 1998 Pontiac Trans Am M6 "The Black Bandit"
    Bought- 11-18-05
    Sold- 10-14-08

  8. #8
    Spaz is My Mentor SMWS6TA's Avatar
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    Can't afford a tranny rebuild.... FFFFUUUUU

    I just baby it for a while more. I see I won't get it on the track this yr.

    Thanks for inputs.

    Shady, after I made my first post I google them and transmissions. I now know what their purpose is but it doesn't take the embarrassment you feel when they grind.

  9. #9
    King 0f n00bz shady milkman's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Can't afford a tranny rebuild.... FFFFUUUUU

    I just baby it for a while more. I see I won't get it on the track this yr.

    Thanks for inputs.

    Shady, after I made my first post I google them and transmissions. I now know what their purpose is but it doesn't take the embarrassment you feel when they grind.
    lol true...i was just giving you a idea...that is my main way of troubleshooting/learning is actually studying the said part and its purpose and most of the time it becomes apparent if it is causing the issue..didnt mean any disrespect

  10. #10
    Spaz is My Mentor SMWS6TA's Avatar
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    Oh no I wasn't offended, just replying to your post. I apply the same thinking. If I can understand it I can fix it.

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    2004 HEAD/CAM CTS-V 9t8z28's Avatar
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    Honestly, most of the time when you pull apart these T56's, the synchros are not that bad. It's the tolerances that cause these trannys to grind and shift hard. Once these trannys get miles on them, the bearings loosen up. The bearings last a really long time and just shimming the bearings cures most issues. Of course when you do dig into it to do this maintenance, it is best or wise to replace with carbon fiber synchros, billit keys and steel shift fork.

    It is said that most parts are pretty strong on the T56, and just setting up the tolerances can make the tranny handle a lot of power.

  12. #12
    Junior Member BADHAWK209's Avatar
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    Quote Originally Posted by SMWS6TA View Post
    Can't afford a tranny rebuild.... FFFFUUUUU

    I just baby it for a while more. I see I won't get it on the track this yr.

    Thanks for inputs.

    Shady, after I made my first post I google them and transmissions. I now know what their purpose is but it doesn't take the embarrassment you feel when they grind.
    your not alone im having the same problem with mine it sucks

  13. #13
    Member MeGoFast's Avatar
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    Quote Originally Posted by BADHAWK209 View Post
    your not alone im having the same problem with mine it sucks
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