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  1. #1
    Junior Member
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    98 z28 m6 3-4 shift grind

    Hey guys , new to the forums here and the ls engines altogether . I built a 10 second 93 z28 years ago so I know the basis of what it takes to make these car handle power and put it down . My previous car was a 4l60 which I got real familiar with where as this old girl is 6 speed . I'm getting a grind when quick shifting gears between 3rd and 4th and I mm pretty sure that it's syncros. The sound seems to come right below the shifter . What's involved in fixing this issue and is there anything else it could be ? I want to fix this problem before I go mod crazy .. Thanks in advance

  2. #2
    Veteran pajeff02's Avatar
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    Black & Blue
    '02 WS.6 / '07 Suburban

    If you are going to have to tear into the transmission anyway you may as well go through it and install upgraded parts where required.

  3. #3
    Spaz is My Mentor SMWS6TA's Avatar
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    Navy Blue Metallic
    98 T/A w/ mods, 00 FBVert

    If it's a stock mc then you need to investing into a Tick Performance MC. Stock one at high rpm/rapid shifts are know to have issues. Something with the orifice not letting the fluid return fast enough.

    There is a drill mod you can do but if you screw it up you're buying a new mc.

  4. #4
    Junior Member
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    Black
    2001 Trans Am Ram Air

    You will also want to replace the 3-4 shift fork, that from the factory is aluminum and there is a TSB on them getting bent, with a steel one. I also had the drill mod done on my stock MC and it helped a lot.

  5. #5
    Senior Member Whamhammer's Avatar
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    Silver
    '02 Trans Am WS-6, 6M

    Quote Originally Posted by SuperMacGuy View Post
    You will also want to replace the 3-4 shift fork, that from the factory is aluminum and there is a TSB on them getting bent, with a steel one. I also had the drill mod done on my stock MC and it helped a lot.
    When did this TSB come out? I am wondering if the shop did mine right in the 09 rebuild.

  6. #6
    Junior Member
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    2001 Trans Am Ram Air

    that was years ago, my local dealer did a rebuild on mine in 2003 or 04. That was under warranty.

  7. #7
    Veteran 35th-ANV-SS's Avatar
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    Red
    02 35th LE Camaro SS

    Yup, the synchros, slider keys, 3-4 fork, rails and output shaft are all weak links of the T56.

    Sent from my SM-G900V using Tapatalk
    Boost gets you laid, unless your name is Jon.

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