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Help with T18 install

Discussion in 'Intermediate CJ-5/6/7/8' started by rejeep, Feb 19, 2014.

  1. Feb 19, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    figured I would ask a few questions here before I go ahead and do what I feel I need to do...

    My configuration is:
    75 CJ6 frame and crossmember
    AMC V8
    77-79 Jeep T18
    Scout D300 (essentially same as a D20)

    tried a generic poly trans mount that didn’t want to fit.
    I ordered a PN 939995 (labeled as a T14 trans mount) fits great...

    current issue is with the crossmember and torque bracket (that I don’t have yet)
    the mount does not line up with any of the holes in the crossmember..
    I was wondering on the orientation of the crossmember and location of the torque stud.

    I have no issue drilling holes and figuring this out that way, I just wanted to make sure I wasn’t missing anything before I start drilling and fabbing...
    Sure this has been done several times before and figured I would ask before I do..
     
  2. Feb 19, 2014
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    Apr 29, 2007
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    3,292
    I had to custom fab a piece for the trans mount and elongated the hole for the torque donut to get it to work........I had several cross members so wasn't afraid to play a bit.........always wanted to custom fab a beefier x member and skid but never got around to it before I sold the 6

    Sent from my SCH-I545 using Tapatalk
     
  3. Feb 19, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    doing some research I found this picture...
    is this how the trans mount and torque stud should be????
    if this offset situation is correct I can understand why I’m stuck...

    [​IMG]
     
  4. Feb 19, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    from timgr...
    is the trans mount offset?

    [​IMG]
     
  5. Feb 19, 2014
    dsrt4

    dsrt4 Member

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    I had to re drill my crossmember to work with my t18. After that I was able to center up the mount.
    I had it offset like that for about a day but it seemed to be really sloppy and moved around a bit.
     
  6. Feb 19, 2014
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    That shows the three-speed mount. If you can make it work with the T-18, great.

    This is the factory mount for a T-18:

    [​IMG]

    It has the snubber on the passenger side. The insulator is a 1370910.
     
    Last edited: Feb 19, 2014
  7. Feb 19, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    the 18.220-1 parts is no doubt the hens teeth part?
     
  8. Feb 19, 2014
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    There is no 18.220-1. Maybe you mean 18.215-1? Just make something from angle iron or such.
     
  9. Feb 19, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    I see 215-1, but there is deff a 200-1 as well.. looks like a piece of flat stock with a sidewise skid..
     
  10. Feb 21, 2014
    zila

    zila I throw poop

    Rock Springs,...
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    Oct 6, 2003
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    I did the same T18 install on my 75 CJ5. I originaly used the stock crossmember and mounts. I recall having to drill the tranny mount to bolt it up to the T18 tranny. The OEM crossmemebr got hammered on rocks etc and was always catchin on something or another. I built a new crosssmemebr out of 3/8" steel. I am still not satisfied and have purchased a universal cross memmber kit from Daves Offroad. Haven't installed it yet but will soon..
     
  11. Feb 21, 2014
    cj6/442

    cj6/442 Sponsor

    Fallbrook, Calif
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    mine looked like this ,I(t's now on the wall ,,,LOVE that forward progress rake it acquired )
    [​IMG]
    so we built this out of DOM and plate
    [​IMG]
    [​IMG]
    [​IMG]
    with skidplate it's small but I have yet to have any problems .it's very strong
    [​IMG]
     
  12. Feb 21, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    Hopefully I'll have some time this weekend to look at this again...

    I'm getting frustrated that in theory it's a stock setup and nothing is just fitting...
     
  13. Feb 22, 2014
    rejeep

    rejeep Well-Known Member 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Rochester, NY
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    ends up I think the adapter plate on the trans/tcase might be my issue...

    the mounting bolt spread is wider than any of the 5 different mounts I purchased to test...
    drilling and tapping today...
     
  14. Feb 22, 2014
    kalex0353

    kalex0353 Member

    Lawrenceville,...
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    Oct 11, 2007
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    I think you are correct about the trans/tcase adapter. The 6 cyl t-14 (SIX-W3ST) and 8 cyl t-15 (V8-WMT) (I don't think the t-18 was available with the V8 from the factory in the CJ-5 until 79 ) mounted via a mounting boss cast into the transmission housing (hence they use the same mount scheme at the same location on the cross member). The 6 cyl t-18 (SIX-W4ST) mounted via holes drilled in the bottom of the trans/tcase adapter plate. The additional length created by the t-18 transmission to bell housing adapter plate plus the transmission to transfer case adapter plate (all stock parts) required that the cross member be located a bit further back on the frame (holes already there from factory) and the part 18.215.1 was also used to moved the mounting point back (and down) a bit more. I had all the stock parts to move from a t-14 to t-18 on my 74 including the torque snubber mounted on the passenger side (once I found it in my parts box).
     
    Last edited: Feb 22, 2014
  15. Feb 27, 2014
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    USMC 0369 (Nick)has a classifieds ad in intermediate section.
    Not listed is a factory 1974 crossmember for a 258/T18 with the cast iron bracket on it.
    I saw it today still mounted on the frame.
    Contact him if you need the parts.

    He also had a gas tank/filler spout/filler neck/vent hose combo still on the body.
     
  16. Mar 6, 2014
    zila

    zila I throw poop

    Rock Springs,...
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    I am almost finished with my crossmember install. It is similar to cj6/442's , but mine is solid at the tranny and has rubber at each end. This is supposed to be an improvement over stock as it gives the drivetrain 4 mounting points instead of three that are in a triangle configuration. The torque is absorbed at each end of the mounts.. I do plan on adding a piece of plate under the Xfer case as cj6/442 did on his for a bit of rock protection.. If there is interest I'll post a few pix.
     
    Last edited: Mar 9, 2014
  17. Mar 7, 2014
    roadhog304

    roadhog304 Member

    Leon Kansas
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    Dec 25, 2007
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    I am interested so please post a pic or two. I want to redo my crossmember and would like some more ideas.
     
  18. Mar 7, 2014
    givemethewillys

    givemethewillys Been here since sparky ran it. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    New Kent, VA
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    Bring on the pics!!!
     
  19. Mar 7, 2014
    zila

    zila I throw poop

    Rock Springs,...
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  20. Mar 9, 2014
    zila

    zila I throw poop

    Rock Springs,...
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    Here's a few crappy cell pix

    [​IMG]

    [​IMG]
     
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