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T90 To T18 Swap

Discussion in 'Early CJ5 and CJ6 Tech' started by colojeepguy, Aug 5, 2022.

  1. Aug 6, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    So with a screwdriver and mallet I can move the 2-3 synchro. Nothing visible worn or broken.
    20220806_085056.jpg
     
  2. Aug 6, 2022
    oldtime

    oldtime oldtime

    St. Charles,...
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    Because the synchronizer blocking plates are notched it is not practical to slide the synchronizer sleeve back and forth by hand. The cane provides much needed leverage. Use a mild tap with a hammer to slide the synchronizer sleeve.
     
  3. Aug 6, 2022
    homersdog

    homersdog Tulsa, Ok 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Can you verify the clutch is working now by turning the input gear while working the pedal?
     
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  4. Aug 6, 2022
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    X2 what Grant says. If the clutch it pushed in, you should be able to rotate the input gear.
     
  5. Aug 6, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Well now I'm pretty convinced this is a bad clutch, although I have never had one act like this. I adjusted it way out, so far that the cable is taut and I'm sure it's running the throw out bearing constantly. I can drive it now, kinda, although it still refuses to shift sometimes.
     
  6. Aug 6, 2022
    oldtime

    oldtime oldtime

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    If it shifts with very tight clutch control linkage and clutch pedal fully depressed then that certainly suggests that it’s time for a new cover plate assembly.
     
  7. Aug 6, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Next dilemma....replace clutch and get it back on the road, or start my 4 speed swap. I have a LOT of irons in the fire and I'm not as young as I once was. Replacing the clutch, I can probably have it on the road by September.
    Trans swap will be a months long project.
     
  8. Aug 6, 2022
    oldtime

    oldtime oldtime

    St. Charles,...
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    Sounds to me like your Jeep is highly suggesting you initiate the transmission swap now.
    Now or never !
     
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  9. Aug 6, 2022
    duffer

    duffer Rodent Power

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    Perhaps but there remains a couple months of high country recreation access. In my world, that is precious time-priceless. IMO, if it is indeed just the cover, I would just replace it and continue with summer plans. The T18/clutch can wait for winter. Do you have access to another cover someplace nearby? Chuck? If not, I have several hanging on the shop wall for the price of shipping.
     
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  10. Aug 6, 2022
    supertrooper

    supertrooper Member

    moreno valley, ca
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    Its good to know that the transmission internals aren't damaged. Just put in a new clutch and enjoy the rest of the summer/fall weather and save the 4 speed swap for the winter.
     
  11. Aug 6, 2022
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    Fix the clutch...keep wheeling for the next few months. Get Ethan under there...
     
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  12. Aug 6, 2022
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    My T-18 swap took about a month and a half once I tore the T-14 out. That was working 3-4 hours a night on it. That also doesn't count several weeks of rebuilding the T-18 ahead of time. Lots of cross-frame mods, OD shifter mods, clutch linkage mods, and floorboard fab involved. I would fix the clutch so you can use the Jeep and do the 4spd swap over the winter.

    You can see the T-18 install in my build thread starting here: 71 Wheeling Rig
     
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  13. Aug 6, 2022
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

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    I vote for fix it and run it. The clutch can be done in 4 hours or less, start to finish.
     
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  14. Aug 6, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    I'm into it about 4 hours and this is as far as I've got.
    20220806_181153.jpg

    Honestly, if I don't do the T18 now I probably never will. I'm 56 years old and this stuff hurts me.
     
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  15. Aug 6, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    How bad do you really need the T18?
     
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  16. Aug 6, 2022
    oldtime

    oldtime oldtime

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    Pull the clutch out and get that part fixed right
    Then see how you feel.
    No need to be in a hurry on decisions.
    Think it over. Overnight always helps.
    Certainly No need to have a 4 speed just because everyone else wants it.
    Get what you really want in the end, but don’t torture yourself to get there.
     
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  17. Aug 6, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Do I NEED it? No, probably not. I've been off roading this Jeep for 22 years all over Colorado. But there's been many times (including last Monday at Wheeler lake) when the 2.79 1st gear in the T90 just doesn't cut it.
    I have the 4 speed, but I'll need to change the input shaft. I have a transfer case for it, but it'll need rebuilt.
    If I buy a clutch for the current setup, it's going g to need a different disc and pilot bushing for the 4 speed.
     
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  18. Aug 6, 2022
    garage gnome

    garage gnome ECJ5 welder

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    You could always put a low range kit in the D18. :whistle:
     
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  19. Aug 6, 2022
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    I vote just fix clutch for now
    a T 18 swap . is really time consuming
     
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  20. Aug 6, 2022
    oldtime

    oldtime oldtime

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    Righto, the driven disc must match the maindrive gear.
    The clutch is mated to a Dauntless …. right ???
    So are you wanting a diaphragm type or 3 finger cover plate assembly ?
    I generally vote diaphragm type unless you plow snow or skid logs.
     
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