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T90 Problems - Diagnosis??

Discussion in 'Early CJ5 and CJ6 Tech' started by DrewDog_CJ3A, Oct 2, 2006.

  1. Oct 10, 2006
    DrewDog_CJ3A

    DrewDog_CJ3A I'm back!!

    Geneseo, New York
    Joined:
    Sep 23, 2002
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    86
    I will "dig into" the T-18 over the weekend. The model, as noted on the side of the case, reads "T-18 1B".

    The case also has the bump-out on the drivers side for the larger gear, I think.

    I think that I am going to flat-tow the jeep to the car wash and sparkle it up. Then I am planning on taking the entire body off and then working on it. When I re-wired the jeep in the spring, I made sure that there is very few wire that need to be disconnected from the engine / fenders. I ran everything in loomes and is very neat looking.... the hard work of the earlier re-wiring is definately going to pay off over the weekend when removing the tub.

    Question: I now have a firewall mounted brake master and booster. Is it better to remove the brake lines from the master and then pull the rest of the brake unit with the body, or remove the master with the lines attached / disconnect the master from the booster. That way everything with the brake system will remain "clean" and closed up??
     
  2. Oct 10, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
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    3,437
    My T18 is a T18-1B as well, with the 6.32 low. It came out of a full-size cherokee, with a 10-foot input shaft ;)
    That was replaced with the Ford short shaft, and used with a pre-'71 225 bell and AA adapter.

    If your tranny came out of a 7, the stickout of the input shaft should only be 6 to 6.5" from the face of the tranny case.
    How deep is your 198 bell? I can't imagine that a T18 out of a CJ7 has a shaft that's 4" too long... unless it came out of a full-size Jeep...

    Hmmmmm, does anyone know if the T18 input shaft is different between CJ7s with a 258 and CJ7s with a 304?? Maybe yours came from a 304 Drew, which has the back of the block farther forward, so would need a longer input shaft/deeper bell to position the shifter correctly in the tub...

    Drew, do whatever it takes... you'll LOVE the T18 :twisted:
     
  3. Oct 10, 2006
    DrewDog_CJ3A

    DrewDog_CJ3A I'm back!!

    Geneseo, New York
    Joined:
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    I am wrong.. The T-18 definately came out of my first CJ-5. It was out of my '76 CJ5 with a 258 I6. (I am already starting to forget what part came out of which jeep;)

    Anyway's, there is a 1" adapter plate between the bellhousing and the tranny, I'm hoping to reuse that adapter plate (template at least). I would say that the bellhousing thats on the T-18 now is a little longer than the 198's, the input shaft nipple sticks out about 3/4", and, of course the 1" adapter plate. All in all, I would say that the input shaft is about 9.5" - 10" long.

    Without sounding... well... ummm... is that the same length as your shaft??
     
  4. Oct 10, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
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    3,437
  5. Oct 10, 2006
    DrewDog_CJ3A

    DrewDog_CJ3A I'm back!!

    Geneseo, New York
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    Thank's Lynn.. I'll take some pics tonight.
     
  6. Oct 10, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    23,596
    According to the '76 Jeep brochure, posted elsewhere here, the '76 T-18 in a CJ should be a close ratio model, and only available with the 258. IIRC the close ratio transmission used the T-15 bell and an adapter plate. In '77, Jeep officially started offering the wide ratio T-18 in CJs, and it was optional with the 304 I presume. I have not seen one of them but according to Novak, the wide ratio CJ transmission has no adapter plate.
     
  7. Oct 10, 2006
    DrewDog_CJ3A

    DrewDog_CJ3A I'm back!!

    Geneseo, New York
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    Hummm.. I think that I will be pulling the top cover tonight and count the teeth. I need to be sure of what I have before I start thinking of this too much.

    Will get teeth count and pics tonight, and post tomorrow.... Thank's guy's
     
  8. Oct 11, 2006
    DrewDog_CJ3A

    DrewDog_CJ3A I'm back!!

    Geneseo, New York
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    Took the shifter plate off and took some pics..

    When I have the x-fer case in low range, I can rotate the input shaft 8.25 revolutions to 1 rev on the output of the x-fer case..
     
  9. Oct 11, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Sounds like 4:1 to me. The D20 is roughly 2:1.

    4.02*2.03 = 8.16 ... pretty close.
     
  10. Oct 11, 2006
    DrewDog_CJ3A

    DrewDog_CJ3A I'm back!!

    Geneseo, New York
    Joined:
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    Your right.. I'm looking at the novak site..

    There is a tag on the T-18 (13.01-023)

    I believe that it is a ford version.
     
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