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D18 transfercase swap - single to double stick

Discussion in 'Early CJ5 and CJ6 Tech' started by termin8ed, May 4, 2005.

  1. May 4, 2005
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
    Messages:
    4,422
    Ok, I searched, but couldn't really find what I was looking for.
    Since I have the transmission and tcase out of the jeep right now, my dad has an extra twinstick D18 that he's giving me. Provided its in good shape, which I believe it is, I would like to swap them out.

    Here's my questions

    Right now I have a 29 tooth maingear coming off the T14, assuming its the 10 spline also. The twinstick tcase is an old one probably original to the 54 3b If it has a 29 tooth 6 spline maingear, I should be able to use mine from my T14, right?

    I see there's also a 26 tooth, 6 spline maingear listed in catalogues. If this old one has the 26 tooth gear, am I going to be able to swap these 2 cases?

    Anything else I should look for between the mating surfaces of the T14 and D18??

    Thanks!
     
    termin8ed, May 4, 2005
    #1
  2. May 4, 2005
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,349
    Brian I don't know for sure about the gears and such, but if you have the twin stick, just take the parts off the old transfercase and put them on yours, it only took me about 3 hours to convert mine from single stick to twin stick.;).
     
    Mcruff, May 4, 2005
    #2
  3. May 4, 2005
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
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    4,422
    Thanks Mike. Thats my backup plan.
    My dad's checking the gears tonight then saturday we're going to be putting things back together. I'll see how it goes then.
     
    termin8ed, May 4, 2005
    #3
  4. May 4, 2005
    screwcity

    screwcity New Member

    Colorado springs, Co
    Joined:
    Dec 16, 2004
    Messages:
    46
    I took the twin stick off of a small hole 18 and swapped it to a big hole 18 I didn't even take it apart to switch out the shift rails...

    I'm going to preface this by saying that it is probably not the correct way to do this conversion but it has worked so far for me!!!

    that out of the way the single stick version has holes in the shift rail. I used a cut off wheel and a grinder and turned the holes into a slot for the end of the shifters to go into. works very well...

    no need to take the whole thing apart. maybe not the best way but maybe it'll work.

    RIo
     
    screwcity, May 4, 2005
    #4
  5. May 4, 2005
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
    Joined:
    Sep 21, 2002
    Messages:
    12,381
    You can't use a 26 tooth drive gear in a 29 tooth case, and visa versa. The gears absolutely won't match. You'd have to swap all the gears.
     
    Glenn, May 4, 2005
    #5
  6. May 4, 2005
    MOP

    MOP Active Member

    Pullman, WA
    Joined:
    Sep 25, 2003
    Messages:
    1,131
    Does a T14 have the same rear bearing adapter as a T86? Basically getting at the old big hole/ small hole tc question.
     
    MOP, May 4, 2005
    #6
  7. May 4, 2005
    Project71-5

    Project71-5 BACON

    Gypsum, CO
    Joined:
    Sep 24, 2002
    Messages:
    897
    I believe that the only case that will work with the T14 is the large hole, mainly because of the rear bearing retainer for the tranny. Otherwise you should just be able to swap the two gears granted the one your getting is 10 spline and the same tooth count. ;)
     
    Project71-5, May 4, 2005
    #7
  8. May 5, 2005
    greencj5

    greencj5 Member

    So. California 91016
    Joined:
    Nov 14, 2004
    Messages:
    165
    Just swap out the single stick front bearing housing for the twin stick housing and your done quickly. That said, some things to check while in there would be the twin stick ouput shaft bearing and seal as well as the shift rod seals. Replace if necessary.
     
    greencj5, May 5, 2005
    #8
  9. May 5, 2005
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
    Joined:
    Dec 22, 2002
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    4,422
    Well, after reading the info base at novak's site, don't think I can just swap the cases out.
    MOP and Joe are right.

     
    termin8ed, May 5, 2005
    #9
  10. May 5, 2005
    MOP

    MOP Active Member

    Pullman, WA
    Joined:
    Sep 25, 2003
    Messages:
    1,131
    You can have the small-hole machined out I believe, but no reason if you have a big hole case already. Swapping the twin stick and freshening up your big hole with a rebuild kit would be easy and worthwhile IMO.
     
    MOP, May 5, 2005
    #10
  11. May 5, 2005
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
    Joined:
    Aug 12, 2003
    Messages:
    1,035
    I'm in the middle of rebuilding my d18 and coverting to twin sticks. My dad had an old d18 that I plan to take the twin stick front end off of. I've got new (used) gears and a rebuild kit on order from Herm. My case is large hole.

    The picture of the twin stick coversion on Herm's web site was very usefull as was the gear chart at the Novak site. And the various writeups.

    1970 CJ-5, 225 V-6, headers, HEI, PS, D30 Fr, 44 Rr, ARB's, SM420 w/ Novak, D18 single stick, 33" TSL Radials, Ramsey REP 5000, Sky Jacker Soft Ride,
     
    AKCJ, May 5, 2005
    #11
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