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  1. #1
    Join Date
    Jun 2016
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    Hereford AZ
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    TKO 600 not smooth between 1st and 2nd

    Guys,
    I have installed a TKO 600 behind an LS3 in a 67 Corvette with custom frame. I have a hydraulic TO bearing (Tilton)....after bleeding the system several times, it goes into all gears fine, but when driving, its clunky between 1st and 2nd. I only have 18 miles on the car and trans....is it likely this will go away as the thing breaks in? By clunky I mean that when moving from 1st to 2nd, I sorta half to pause during the shift or it will seem as if it would have to be pulled hard into gear....I have clutch stop set and it all seems to go through gears well and reverse, except 1 - 2....thoughts? I did align the bell housing before installation.



  2. #2
    Join Date
    Jun 2010
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    Only thing I can think of was the bellhousing alignment, but I would also say the clutch may not be fully releasing. That doesn’t sound like something that will go away.
    1970 Camaro/DSE build


    Are you driver enough? Maybe....come on blue!
    https://www.pro-touring.com/threads/...71#post1147371

  3. #3
    Join Date
    Jun 2016
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    Hereford AZ
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    Quote Originally Posted by badazz81z28 View Post
    Only thing I can think of was the bellhousing alignment, but I would also say the clutch may not be fully releasing. That doesn’t sound like something that will go away.
    thanks....bell housing was aligned...

  4. #4
    Join Date
    Mar 2009
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    Houston, TX
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    What about when the car running but stationary? If you can shift between 1 & 2 with the car stopped/engine running, I don’t think it’s clutch related.
    Tu Ho
    Firebird V2-LS swap

  5. #5
    Join Date
    Jun 2010
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    There’s only TWO reasons why a perfectly good transmission would be difficult to shift. One would be the clutch not properly releasing and side loads on the input shaft. If you are confident the alignment is good, verify clutch release.


    Quote Originally Posted by Vjjack03 View Post
    thanks....bell housing was aligned...
    1970 Camaro/DSE build


    Are you driver enough? Maybe....come on blue!
    https://www.pro-touring.com/threads/...71#post1147371

  6. #6
    Join Date
    Mar 2008
    Location
    Chicago suburbs
    Posts
    637
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    Mine was clunky when new but smoothed out after a few hundred miles

  7. #7
    Join Date
    Jul 2016
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    338
    Country Flag: United States
    You have upgraded synchros ??

  8. #8
    Join Date
    Mar 2018
    Posts
    41
    When you say the bell housing was aligned... do you know what the runout was? If dowels were used?

  9. #9
    Join Date
    Jul 2016
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    338
    Country Flag: United States
    I have about 150 miles on my TKO 600. I must say I think my Muncie shifted better than this thing LOL

  10. #10
    Join Date
    Apr 2001
    Location
    The Druid City
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    14,370
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    Did you confirm that the Tilton bearing was in fact fully releasing the pressure plate?

    Andrew
    1970 GTO Version 2.0
    1967 Cougar build
    GM High-Tech Performance feature
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    "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

  11. #11
    Join Date
    Feb 2013
    Posts
    453
    Country Flag: United States
    Maybe a dumb question but was the case filled with the correct fluid?

    I had some work down on my car years ago and the mechanic used manual transmission fluid instead of ATF. The shifting was a little rough.

  12. #12
    Join Date
    Mar 2018
    Posts
    41
    Vjjack03,

    Any update/resolution on this? I’m interested in hearing

  13. #13
    Join Date
    Sep 2014
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    Sun City West, AZ
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    630
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    What tranny fluid are you using was going to be my question too? I believe Tremec recommends the GM Synchromesh tranny fluid and now they have their own brand. I would stick with their recommendation.

    Another problem could be the pedal travel. You could be pushing the pedal too far and beyond the disengagement point and you may have to put a pedal stop on your pedal and adjust it accordingly.

    What clutch assembly are you using?
    --
    Kenny Mitchell
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