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T86. Vs T90 Gears

Discussion in 'Early CJ5 and CJ6 Tech' started by DanStew, Oct 17, 2021.

  1. Oct 17, 2021
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    So can anyone tell me if i have t90 guts in my T86 case?

    Here is the "T86" that came with my recent purchase.
    2.jpeg
     
    DanStew, Oct 17, 2021
    #1
  2. Oct 17, 2021
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    Here is the T90 crusty gear box from my CJ2a
    1.jpeg
     
    DanStew, Oct 17, 2021
    #2
  3. Oct 17, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    T-90 gears.
     
    timgr, Oct 17, 2021
    #3
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  4. Oct 17, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    These are T-86 gears.

    T-86gears.png
     
    timgr, Oct 17, 2021
    #4
    jeepstar, FinoCJ and DanStew like this.
  5. Oct 17, 2021
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    Great. I wish it was the original T14, but i guess i will not complain about the T90. I am just glad i do not have the t86. Now it is time to order some rebuild stuff
     
    DanStew, Oct 17, 2021
    #5
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  6. Oct 18, 2021
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Quick and easy ID for T90 guts is the straight splines on the mainshaft. The T86 mainshaft splines have the slight twist seen in Timgr's photo in post#4. Yes, at least you can get parts for the T90.
    Be sure to source a USA made 2nd gear, and count the teeth on your input shaft (33 or 35) to make sure they are compatible with whatever cluster gear is used. The 1st gear ratio varies between the T90a and T90c, using different tooth counts on both the mainshaft and cluster gears.
    -Donny
     
    Keys5a, Oct 18, 2021
    #6
  7. Oct 18, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    My understanding is there is no long input gear for the T-90C, so a T-90 conversion of a T-86 with the factory adapter has to be T-90A (actually T-90J) gears.
     
    timgr, Oct 18, 2021
    #7
  8. Oct 18, 2021
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
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    The transmission does have a long input shaft that the other t90. when i get it all apart i can get the teeth counted.

    First i have to clean it up and remove the rodent house
    tranny copy.jpeg
     
    DanStew, Oct 18, 2021
    #8
    Twin2 likes this.
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