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What Transmission Do I Have???

Discussion in 'Early CJ5 and CJ6 Tech' started by Norton, Apr 13, 2021.

  1. Apr 13, 2021
    Norton

    Norton New Member 2021 Sponsor

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  2. Apr 13, 2021
    Jw60

    Jw60 Airbender and interrupter of the light guard. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Sedalia MO.
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    Looks like a T90-j from here.
    It would have had a T90-c but the gears are different tooth count and the input shaft is different between them.
    Seems they pulled everything forward to make it work.
    Any tags and stamps are null and void at this point.
     
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  3. Apr 13, 2021
    Dave B

    Dave B Frankenjeep '67

    Northern Minnesota
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    This may help in ID--

    1.) A top loaded, top shifting transmission using a cane shift lever. Correct?

    2.) 3 speed. Correct?

    3.) Mated/married up to a twin-stick transfer case. Correct? Do you know the transfer case model?

    4.) What make of motor is the 4-cylinder---the General Motor/Pontiac Iron Duke?

    As suggested --perhaps>>>The Novak Guide to the Borg-Warner T90 Transmission
     
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  4. Apr 14, 2021
    Norton

    Norton New Member 2021 Sponsor

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    Wow, lets see if I can help answer more of your questions.
    It is a 3 speed.
    Yes, the transfer case is twin stick.
    The motor is stamped GM 10009542-1 on the block.
    From what I understand, this is the "Iron duke."
    I dont know a top loaded, from any other kind. So I will have to look at that more.
    I will look at the t90, as you suggested, and see how that goes.
    Thank you guys! I will let you know what i find.
     
  5. Apr 14, 2021
    Keys5a

    Keys5a Sponsor

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    I'll second the T90-j as used in the Willys Wagons/Pickups, or at least a T90 with the long 18 tooth main drive gear. That looks to be an aftermarket adapter/spacer between the Chevy bellhousing and the transmission. Look for "AA" or advance adapters cast in it.
    You will likely find "T90a-1" cast on the upper drivers side of the main transmission case. That is a Dana 18 Transfer case. All above was a very common "conversion" from the late '60s-up when swapping engines in Jeeps.
    -Donny
     
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  6. Apr 16, 2021
    Warloch

    Warloch Did you say Flattie??? Staff Member

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    Known adaptors for that setup are Novak, AA and Offenhauser. Brand mark and model may help as well, but I would bet the long nose T90 input just like you use for a 225 adaptor kit.
     
  7. Apr 16, 2021
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

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    Front bolt pattern is small, like a T-90.

    According to this Jeep Transmissions: T-90 there should be a "T-90" cast in to the side of the transmission case. Realize that your pictures show mostly transfer case, mounted behind the transmission, not transmission. Get under there with a bright light and mirror and see if you can read some casting marks in the transmission. Or take the floor plates off and look from above.
     
  8. Apr 16, 2021
    Jrobz23

    Jrobz23 Member

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    That is a standard Chevy bellhousing, so likely is the 80-83 GM 2.5L engine from a Jeep.
     
  9. Apr 16, 2021
    Norton

    Norton New Member 2021 Sponsor

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    You guys nailed it. I got up under there with an inspection mirror, a mumbled cussword, and a flashlight.
    It looks like is says T90A-1 (or J) i cant tell.

    Also, the transfer case has a plate on top, that is just about unreadable. But i swear in the bottom right portion it says Series 18.
    Maybe that is my imagination, but does that sound right?
     
  10. Apr 16, 2021
    Mr Vaughan

    Mr Vaughan Fly by the seat of your pants

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    it says T90A-1, i believe the J was never stamped on there. it has to be an 18, due to the offset rear and T90.
     
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  11. Apr 16, 2021
    Warloch

    Warloch Did you say Flattie??? Staff Member

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    Yup - D18 TCase passenger drops front and rear.
     
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  12. Apr 17, 2021
    Keys5a

    Keys5a Sponsor

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    The only transfer cases I know with a tag on top are early Brown & Lipe (pre-Dana) models from the mid/late 1940s. Measure the end of the intermediate shaft, located on the back side between the parking brake drum and the 5 bolt rear cover plate. It has a D shape end for a locking tab. It could be 3/4", 1 1/8", or 1 1/4". This will give and approximate estimate of the vintage of the transfer case. Either way, that is a Dana 18 (D18) transfer case.
    -Donny
     
  13. May 2, 2021
    Norton

    Norton New Member 2021 Sponsor

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    I was incorrect. The metal tag is in the top forward right side of the trasmission, as viewd looking down from the drivers seat.
     
  14. May 2, 2021
    Norton

    Norton New Member 2021 Sponsor

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