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Thread: Identifying 5 speed tranfer case and output shaft

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    Question Identifying 5 speed tranfer case and output shaft

    Hi All,

    I have looked but can't find it. I have a 1990 GTO TT. It should have an 18 spline OS and early TC but it currently has the TC with the sight hole which I thought was indroduced 92-93 era which is when they also changed to 25 spline. So does that mean I'm running a 25 spline OS?

    According to 3SX


    Pics of my TC




    Cheers,

    Joe
    1990 JDM GTO TT with Vi-PEC plug-in V44 EMS, TD04-13T's, 3SX Downpipe, MP Hi-flow cat, ARC SMIC's, Aeromotive Stealth 340LPH pump, Fuelab 515 FPR, Ninja Performance 75amp hotwire kit, oohnoo fuel loop & rail adapters, Nylon braided ethanol fuel line, NGK AFX Wideband, K&N FIPK, Iridium plugs, HKS Twin Power DLI, Turbo XS racing BOV, 3SX poly mounts, Custom 280km/h speedo.

    Waiting install
    Injector Dynamics 725cc Injectors.

    Build Thread

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    I AM IMPORT POWER Feedback Score 1 (100%)
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    You can put a sight hole cover onto a converted 18 spline. So the only way to tell is to pull the TC off.

    -Chris

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    Twin Turbo verified Feedback Score 5 (100%) GTOJOE's Avatar
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    Quote Originally Posted by Import Power View Post
    You can put a sight hole cover onto a converted 18 spline. So the only way to tell is to pull the TC off.

    -Chris
    By converted you mean small bearing to big bearing????

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    Feedback Score 13 (100%) Austin@STM's Avatar
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    Quote Originally Posted by GTOJOE View Post
    By converted you mean small bearing to big bearing????
    That or 25 spline converted, just pull it off, its pretty easy to do, and then you will know for sure. Why are you wondering, did something go bad in the drivetrain?

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    Quote Originally Posted by Austin@STM View Post
    That or 25 spline converted, just pull it off, its pretty easy to do, and then you will know for sure. Why are you wondering, did something go bad in the drivetrain?
    Not yet but as you know I have been thinking about engine upgrades and figured that maybe I should do something about the "weak" spots as they are more likely to break if more power is pushed through them LOL. Depending on how much I have available funds wise looking at a SS housing etc.

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    Looks identical to my `91 GTO 18 spline TC unfortunately.

    The 18 splines get a bad rap but I`ve done 200+ launces on mine and it`s all still in one piece!, got a 300m output shaft to go in when I get round to fitting it..
    GTO-TT, PTE 1200's, M20, Emanage Ultimate, OS Geiken R3C,
    TD04-16g`s, Maf-t. 13g`s 12.4@115mph / 16g`s 12.5@117mph.

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