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T18 Id?

Discussion in 'Early CJ5 and CJ6 Tech' started by mikieboy, Sep 14, 2006.

  1. Sep 14, 2006
    mikieboy

    mikieboy Member

    Jacksonville, FL
    Joined:
    Mar 21, 2005
    Messages:
    155
    How do you tell the difference between the low gear(6.32.1) and the
    (4.2.1) T18? The one I am looking has these markings.
    Case-- T18-1B
    Tag on shift cover--5358092 13-01-187
    How to tell which one this is?
    Thanks..
     
    mikieboy, Sep 14, 2006
    #1
  2. Sep 14, 2006
    181jeep

    181jeep Banned

    central valley, ca
    Joined:
    Feb 3, 2004
    Messages:
    376
    put it in 1st gear and turn the output shaft 1 revolution while counting the number of turns of the input shaft. if it makes 4 revolutions it is a 4to1, if it makes nearly 6-1/3 it is a 6.32 to 1

    JB
     
    181jeep, Sep 14, 2006
    #2
  3. Sep 14, 2006
    jpflat2a

    jpflat2a what's that noise?

    Hermosa, SD
    Joined:
    Jul 30, 2003
    Messages:
    8,521
    the tag number indicates it came from a 1978 CJ model
    those were the low 1st gear if I recall
     
    jpflat2a, Sep 14, 2006
    #3
  4. Sep 14, 2006
    CJ-X

    CJ-X Member

    Ohio
    Joined:
    Aug 6, 2006
    Messages:
    816
    Simple as that. If it is hard to turn, spin the input shaft.

    You can't go by tags or castings, someone like me may have changed it!:beer:
     
    CJ-X, Sep 14, 2006
    #4
  5. Sep 15, 2006
    mikieboy

    mikieboy Member

    Jacksonville, FL
    Joined:
    Mar 21, 2005
    Messages:
    155
    Thanks for the replys, the trans is in a vehicle, so I can not turn shafts. How do you decode the tag, or where can I look to find decoding info?
    Also on the case where it says T18-1B, what is the 1B for? Others that I have seen had 1A on them.
     
    mikieboy, Sep 15, 2006
    #5
  6. Sep 15, 2006
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Jim gave you the decoding info above. You can decode the Jeep PN using the old parts books. I don't know of any way to decode the B-W number. The casting numbers in the case don't help.

    If it's in a vehicle, and that vehicle looks like a '78 CJ, then it's almost certainly the right tag, and a wide ratio transmission. The close ratio T-18s were only used in the 72-76 CJs AFAIK.
     
    timgr, Sep 15, 2006
    #6
  7. Sep 15, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    My T18-1B came from a full size Cherokee, and was 6.32:1... but it had a mile-long input shaft. I had to swap it out for the shorter shaft (still 6.32:1) to use in my '71.

    What vehicle is this tranny in? You buying this vehicle, or the tranny?
     
    lynn, Sep 15, 2006
    #7
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