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How can I tell if my t-18 is a OE or not

Discussion in 'Early CJ5 and CJ6 Tech' started by sean, Aug 30, 2005.

  1. Aug 30, 2005
    sean

    sean New Member

    Joined:
    Aug 6, 2005
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    10
    It's a 71 cj5 with the dauntless, and aside from talking to the original owner, which isn't possible can you tell from the bell housing or is it in the vin? Any other thoughts
     
  2. Aug 30, 2005
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    Jul 30, 2003
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    7,860
    not in the VIN
    the trans tag # should be: T18: AS9-T18C
    best way would be the floorboards IMO
    factory floorboard/shift tower covers would all be bolted/screwed down
    in other words, they would have that "factory" look
    it would take exteme talent to fabricate some that duplicated factory style
    (not that it couldn't be done)
    I am guessing by stating that it should have 15-18 bolts/screws that secure it to the floor.
     
  3. Aug 30, 2005
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Uh, one indication would be a 4.02:1 1st gear instead of the 6.32:1 usually seen in Jeep and Ford truck T18s. Another would be if you have the factory floor pans that accomodate the larger T18 shift tower. I think Tim Harris has some pictures of those that are posted here somewhere.

    Not sure what the bell and plate adapter would be. I would guess there would be the BOP-to-T14 bell with a plate adapter, but I can't say for sure. Probably your best indication is the fit and finish (ha!) of the parts used. A conversion usually looks cobbled together, where a factory installation should fit together well.

    If your T18 has a Ford pattern to the front, I'd think that's a good indication that it's not factory. This T-150 has a ford pattern. http://www.novak-adapt.com/knowledge/t150.htm This T18 is a Jeep pattern: http://www.jeeptech.com/wiki/index.php/Image:T18f.jpg

    There may be a tag on the top of the transmission (under one of the cover bolts) with a Jeep part number. They always came with a tag, but sometimes they are lost. Maybe someone here can look it up in the Jeep parts books.

    There's no info in the VIN re transmissions till 1972 AFAIK.

    <edit> Heh. I was typing while Jim was answering. Reassuring to me to see that my answer overlaps with the expert opinion so much.
     
  4. Aug 30, 2005
    sean

    sean New Member

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    thanks guys

    I appreciate the info I'll have to have a look see now.
     
  5. Aug 30, 2005
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    I'm no expert :shock:
    at least we are thinking along the same lines though :D

    like Tim said and I was trying to say, I think how it looks/appears will speak volumes on whether it is factory or not
     
  6. Aug 30, 2005
    Posimoto

    Posimoto Hopeless JEEP Addict

    Minden, Nevada
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    Aug 7, 2003
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    I don't believe that a T18 was ever offered with the Dauntless. AFAIK it wasn't available until '72 with the straight 6.
     
  7. Aug 31, 2005
    JeepManEd

    JeepManEd New Member

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    Aug 25, 2005
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    Quick quote for Posimoto, and some information from Off-road.com
    "The T-18 was optional on CJs from 1971-1979. The T-18A version used from 1977-1979 is the best transmission ever put in a CJ by the factory since it features a granny low first gear(6:32:1.) Earlier T-18s have the same great strength, but a 4.03:1 first. The T-98 is the predecessor to the T-18 that was an option for CJs from 1955-1970."
     
  8. Aug 31, 2005
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    Expanding on this, as I understand it: the T-98 was only available with the F134, and has the 6.32:1 1st gear. These are in great demand today, but there are quite a few of them around.

    The 4.03:1 T-18 behind a V6's existence was debated here, but I think we have seen pretty good evidence that it was available. We have (had) a member in near Lassen in NE California that had one. There's also good evidence from the Jeep parts books that they existed, as I understand. Maybe there are some first-hand claims that they existed too - though I came to Jeepin' a few years too late to support that claim. Assuming they were available, precious few of them were built.
     

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