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T14 or T90?

Discussion in 'Early CJ5 and CJ6 Tech' started by Toolmaker, May 24, 2009.

  1. May 24, 2009
    Toolmaker

    Toolmaker Member

    Westminster, SC
    Joined:
    Oct 3, 2005
    Messages:
    132
    Last fall the input gear on my T14 broke 3 teeth. I wasn't being hard on it either, just normal driving. I want to get my Jeep back on the road as soon and as cheap as possible. I've got a T90 with a V6 adapter in unknown condition that I could go through and install. Which would be better, fix the T14 or go through the T90 and use it?
     
  2. May 25, 2009
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    i would fix the t14, rather the use an tranny of unknown condition.
     
  3. May 25, 2009
    jeep2003

    jeep2003 Well-Known Member

    Upstate NY
    Joined:
    May 30, 2006
    Messages:
    1,918
    the t-90 doesnt have syncho in 1st. which means you have to come to a stop to shift from 2nd down to 1st which can be annoying. Also i believe they started puting the t-14 behind the v6s because the t-86 couldnt take much abuse. and the t-86 is just a modified t-90. I say stick with the t14. plus the t-90 is 5/8" shorter i think so it will take a little modifying of the lincages and crossmember
     
  4. May 26, 2009
    gte636p

    gte636p Member

    smyrna, Ga
    Joined:
    Sep 23, 2002
    Messages:
    492
    I went through this and sourced a t-15 to throw in at the time and have a 420 for when that breaks. After becoming a pro at rebuilding the T-14 (out, rebuilt, and back in under 2 hours) it was most definitely time to move on.

    If money is an issue try and get the T-14 up and running, but try and remember to be on the lookout for something else too. It made my problems go away.
     
  5. May 26, 2009
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
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    23,596
    I'm not a big fan of the T-14, but I would pick it over the T-90. The T-86 is basically a T-90 with a few refinements to make it quieter and shift easier. They are so similar that you can take the guts from a T-90 and put everything in a T-86 case. That said, I think Jeep went to the T-14 behind the V6 because the T-86 seemed very dated, even for the '60s.

    I would prefer the ratios of the T-86 or T-90 to the T-14, but the T-14 is a little larger and stronger, and is fully synchromesh. If you want to stay with a 3-speed, the T-15 is superior to all of these, but unfortunately was never offered with the V6. I know that the T-15 can be adapted to the V6, but I don't know the details.
     
    Last edited: May 26, 2009
  6. May 26, 2009
    wagoncab

    wagoncab New Member

    Joined:
    May 23, 2009
    Messages:
    12
    Hi Folks;
    Since I am new to this older jeep stuff, I have a question...How do I know which tranny I have in my 66. Is there a tag or something stamped on the tranny?
    I also found out that the transmission was replaced very shortly before the jeep's owner passed away and it was parked. So, whatever is in there, it is almost new
    Thanks
    Cindy
     
  7. May 26, 2009
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
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    23,596
    V6 or 4-cylinder? All the F134 4-cylinder Jeeps used the T-90. A '66 V6 CJ-5 should have a T-86. It should have "T86" cast into the side of the case (I think) or there may be a tag attached to one of the top cover bolts, accessed by removing the floor plate.

    www.jeeptech.com has pages covering the factory transmissions, but it's down right now. When it's back up, go there and try
    Transmissions > Factory Options > T-86 to check on identifying features of the T-86.

    BTW it's preferred that you start a new thread to ask a new question. This is a "hijack" and considered bad form. The Admins will probably split this off into its own thread.
     
    Last edited: May 26, 2009
  8. May 26, 2009
    Toolmaker

    Toolmaker Member

    Westminster, SC
    Joined:
    Oct 3, 2005
    Messages:
    132
    I've got a T176 D300 combo that I want to eventually put in but right now work is slow so money's tight. I'll have to swap out the rear end to make that combo work too. I guess my cheapest & quickest option is to fix the T14.
     
  9. May 26, 2009
    wagoncab

    wagoncab New Member

    Joined:
    May 23, 2009
    Messages:
    12
    I didn't mean to "highjack"

    Sorry :(
    Cindy
     
  10. May 26, 2009
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
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    Didn't mean to make you sad ... just wanted to give you a tip. No need to apologize. :coffee:
     
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