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T90 To T18 Swap

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

  1. Sep 16, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    I'm waiting until the trans and tcase are bolted up before I start to work on the cross member and floor pan.
     
    Last edited: Sep 16, 2022
    Buildflycrash likes this.
  2. Sep 17, 2022
    windyhill

    windyhill Sponsor

    PA
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    I used my stock crossmember and fabricated and bolted a bracket off the back of it with a standard GM think 2 bolt trans mount. aluminum adapter sat basically 1" behind the cross member. it worked great. Yep on the cover, cut it down the middle and added a strip, it worked great.
     
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  3. Sep 17, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Not much jeep time this weekend, but I took a half hour to tear apart the big hole tcase. I'll only use the case and the pan, and use all the guts from the other case.
    20220917_174215.jpg
     
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  4. Sep 29, 2022
    garage gnome

    garage gnome ECJ5 welder

    Western MA
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    Lots of good information in this thread. I'll be doing the same to snowshoe next year.

    I made a bracket/linkage setup on my T18 in Ted to make the transfer case shifters come through the original hole in the floor.

    [​IMG]

    [​IMG]
     
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  5. Oct 16, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Finally got a little free time today to put the tcase together, ready to go on the back of the 4 speed.
    20221016_163132.jpg
     
  6. Oct 16, 2022
    Rich M.

    Rich M. Shoe salesman 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Might wanna rethink that drum based on recent experience. Mmmhmmm.
     
  7. Oct 16, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    It's nothing like what you experienced, but mine does show evidence of some rock damage...
    20221016_174555.jpg
     
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  8. Oct 16, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    The twin stick D18 front housing won't fit behind a T18. I had intended to mock this up with the bare case, but I totally spaced it out, so I had to do the transfer case bench press several times with the complete case while I got that sorted out. I had to grind approximately 1/4" off the tcase to get it to bolt up. 20221016_171545.jpg

    It fits!
    20221016_171804.jpg
    Next up, overdrive install with that %@&×! snap ring :rolleyes:
     
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  9. Oct 16, 2022
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Pullman, WA
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    Nice work!
     
  10. Oct 16, 2022
    Jw60

    Jw60 Dropping towbars 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Almost there!
     
  11. Oct 17, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Install OD
    Modify crossmember (or build a custom one?)
    Get driveshafts modified.
    Hook up clutch &E brake.
    Figure out OD shifter. (anyone with a T18 & OD please feel free to share pics of this!)
    Heat & bend shifters.
    Modify or build new trans cover.
    Probably something I'm forgetting...
     
  12. Oct 17, 2022
    Jw60

    Jw60 Dropping towbars 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    Longer speedometer cable
     
  13. Oct 17, 2022
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    • Hook up backup light switch
    • Swap front yoke in D27 for larger U-joint
    • Fill everything with oil and make sure the drain plugs are tight!
     
  14. Oct 17, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    My Jeep doesn't have any.
     
  15. Oct 17, 2022
    Fireball

    Fireball Well-Known Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    The horror!
     
  16. Oct 17, 2022
    dnb71R2

    dnb71R2 SuperDave 2023 Sponsor

    Grand Mesa, CO
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    Now is the time to add them! ;)
     
  17. Oct 17, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Maybe...the 4 speed has a switch for them which the T90 did not.
    Pretty low on my priority list though.
     
  18. Oct 17, 2022
    3b a runnin

    3b a runnin Active Member 2023 Sponsor 2022 Sponsor

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    It really is pretty easy. I found a small LED light, I think Amazon, that fit right in the factory hole in the bumper.
    upload_2022-10-17_19-9-9.png
    Its actually on the inside
     
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  19. Oct 17, 2022
    colojeepguy

    colojeepguy Colorado Springs

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    Started mocking up the trans mount...I think I'll be able to use the stock crossmember with only minor modifications.
    My exhaust system however, I think that's going to be a problem :rolleyes:
     
  20. Oct 17, 2022
    timsresort

    timsresort Active Member 2023 Sponsor 2022 Sponsor

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    Bare metal, or is that paint on the case?
     
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