308 GT4 Gearbox Fork adjustments | FerrariChat
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308 GT4 Gearbox Fork adjustments

Discussion in '308/328' started by guilhem74, Sep 22, 2025 at 11:07 AM.

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  1. guilhem74

    guilhem74 Rookie

    Jan 9, 2025
    11
    Full Name:
    guilhem Clerc
    #1 guilhem74, Sep 22, 2025 at 11:07 AM
    Hello All,

    During this winter, i planned to change the selectors seals.

    I also have a small issue, it is most of the time hard to get out of the 1st gear, I already did the lever adjustment.

    So as i remove the pan of the gearbox, i will double check all the forks.

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    Is there any data about clearance between the fork in the picture ? From what i've read the second should be the reference and horizontal.

    Also for the selector fork, they should be right in the middle of the two pignon, and when engaged, clearance should be similar on both side (between pignon and selector) ?
     
  2. DanielGA

    DanielGA Karting

    Mar 19, 2018
    196
    Midwest
    Full Name:
    Daniel A.
    #2 DanielGA, Sep 22, 2025 at 11:26 AM
    Do you mean clearance between the R-1, 2-3, and 4-5 forks? I recently had mine open because I had some roughness in changing gears. I did notice the spacing between the forks was the same and when shifter was in the middle of the gated shifter it was also in the middle of the forks. Forks and shifter can be regulated. I had to regulate the shifter (by adjusting the linkage rod connection) and then all was better. Not sure if this helps...
     
  3. miked

    miked Formula Junior

    Feb 7, 2001
    914
    Cincinnati, Ohio
    #3 miked, Sep 23, 2025 at 10:03 PM
    I stumbled across this video today about aligning the shift forks in a Mondial OV, I would think that it's the same as a GT4. Not the greatest tutorial but it may give you some insight to the adjustments.


    When I got my GT4 over 25 years ago the shifter was a bit off but I was able to slightly rotate the shift rod at the threaded sleeve (much like a tie rod) located where the shift rod exits the body. My shifter has worked perfectly ever since.
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