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transmission case widths

Discussion in 'Early CJ5 and CJ6 Tech' started by M38a1diesel, Dec 19, 2005.

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  1. Dec 19, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
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    Jun 4, 2005
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    254
    What is the skinniest transmission that can be mated to the Dana 18?
     
    M38a1diesel, Dec 19, 2005
    #1
  2. Dec 19, 2005
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
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    3,437
    Jeep trannies are about the skinniest you can find.
    Here are some measurements, using the two upper tranny-to-bell bolt holes, ctr-to-ctr, identified as "L"; and the two lower bolt holes, ctr-to-ctr identified as "M"

    T85 3-speed L - 5.25, M - 6.25 (65-66 J-series w/327)
    T86 3-speed L - 6.00, M - 6.00 (66-68 CJ)
    T90 3-speed L - 6.25, M - 6.25
    T14 3-speed L - 6.00, M - 6.00

    For 4-speeds, the T18 & T98 & NP435 is L - 8.50, M - 8.50
    SM420 and SM465 show L - 8.25, no listing for M.

    Source: Advance Adapters Booklet JP008, circa 4/1/95.

    HTH!!
     
    lynn, Dec 19, 2005
    #2
  3. Dec 19, 2005
    mruta

    mruta I drank with Billy!

    Downers Grove, IL
    Joined:
    Sep 22, 2002
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    422

    Are you talking about the area where it bolts to the bellhousing or the body of the trans? Just shooting from the hip here but I know the Muncie M-21/22 transmissions can be mated to the D18 and the bodies are really skinny.
     
    mruta, Dec 19, 2005
    #3
  4. Dec 19, 2005
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    Sep 20, 2002
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    3,437
    The source info I have shows the Muncie and Saginaw trannies as L - 8.25, M - 9.12
    But as said above, these are the mounting points, not the case body. I have no source of info for width of case bodies.... so as Mike said, some of these may be skinnier, or wider, in the body than the mounting points may suggest.
     
    lynn, Dec 19, 2005
    #4
  5. Dec 19, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
    Joined:
    Jun 4, 2005
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    254
    I was mainly intersted in the width of the cases, however the width of the mounting points also comes into play.

    I want to mate the bellhousing on the right to a T90, however I'm concerned that there may not be sufficient clearance to retain the slave cylinder in its stock location:
    [​IMG]
     
    M38a1diesel, Dec 19, 2005
    #5
  6. Dec 19, 2005
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
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    Sep 10, 2003
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    2,084
    might need a spacer plate. have you mocked it up yet?
     
    66cj5, Dec 19, 2005
    #6
  7. Dec 19, 2005
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Mar 4, 2003
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    5,472
    If you want more info on the Muncie setup - let me know. I have one sitting on a shelf with the D18 convertion kit and a hurst shifter that I Pulled.

    FWIW - It worked great, just not what I wanted and I put a T-90 in it's place.
     
    Warloch, Dec 19, 2005
    #7
  8. Dec 19, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
    Joined:
    Jun 4, 2005
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    254
    What size clutch discs are available for use with the Muncie, and can a Warn Overdrive be used behind it? Just curious.
     
    M38a1diesel, Dec 19, 2005
    #8
  9. Dec 19, 2005
    mruta

    mruta I drank with Billy!

    Downers Grove, IL
    Joined:
    Sep 22, 2002
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    422
    Clutch disc sizes are only limited by your flywheel. With something as common as a Muncie M21/22 your possibilities should be almost endless. If you're hooking this up to a D18, an OD will work fine.
     
    mruta, Dec 19, 2005
    #9
  10. Dec 19, 2005
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    I didn't have an OD in it when I took it out, but it will be easy to check to see if one would fit.

    Clutch is determined by the combo of the fly wheel (I have seen 8 to 10 inch clutches in these) and tranny input shaft. Like mruta said... almost endless as it is a pretty standard tranny input shaft size.

    You want pics and measurements? I'll try to get them tomorrow night.
     
    Warloch, Dec 19, 2005
    #10
  11. Dec 19, 2005
    Ghetto Fab.

    Ghetto Fab. Member

    Atascadero, Ca.
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    Jan 13, 2005
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    512
    If this is to mate that benzo diesel to your trans then I think we're gonna need more pictures as that seems like an interesting conversion.

    Is the slave cylinder location that important? Can it be mounted in some other way? Just seems like a penny holdin up a dime kinda deal. Why not figure out what trans you want and then adapt the slave situation to that instead of vice versa.

    Understandably though I really don't know what you situation is or what your having to work around.

    Kevo
     
    Ghetto Fab., Dec 19, 2005
    #11
  12. Dec 20, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
    Joined:
    Jun 4, 2005
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    254
    I'm probably gonna stick with a T90. I just wanted to explore all options prior to making a "concrete commitment", so to speak.
     
    M38a1diesel, Dec 20, 2005
    #12
  13. Dec 20, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
    Joined:
    Jun 4, 2005
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    254
    Oh yeah, the slave cylinder wouldn't have to stay in that location either. I'm toying with the idea of possibly using a hydraulic throwout bearing, or even reverting back to mechanical linkage if push comes to shove.
     
    M38a1diesel, Dec 20, 2005
    #13
  14. Dec 20, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
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    Hey Warloch, could I see some pics and dimensions of the transmission you have?

    Might you be willing to part with it? ;)

    Can anyone shoot me even just a rough measurement of the width of a T90 case?

    TIA!
     
    M38a1diesel, Dec 20, 2005
    #14
  15. Dec 20, 2005
    DanStew

    DanStew Preowned Merkin salesman Staff Member

    Lexington, South...
    Joined:
    Sep 22, 2002
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    4,586
    is the T90 going to last behind the deisel? Even though it is smaller, what is th etorque value of the iesel? And more importantly what is your diriving tyle?? Lead Foot?? :)
     
    DanStew, Dec 20, 2005
    #15
  16. Dec 20, 2005
    M38a1diesel

    M38a1diesel Member

    Wake Forest, NC
    Joined:
    Jun 4, 2005
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    254
    I would think so. This ain't exactly an 855 Big Cam we're talking about. ;)

    MB OM616 diesel:
    71HP @ 4100 rpm
    128ft./lbs @ 2400 rpm

    :hurrican: :
    72HP @ 4000 RPM
    114 lbs. ft. @ 2000 R.P.M
     
    M38a1diesel, Dec 20, 2005
    #16
  17. Dec 20, 2005
    mb82

    mb82 I feel great!

    Charlottesville Va
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    Mar 17, 2003
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    2,706
    Dang can those motors be much closer in numbers?
     
    mb82, Dec 20, 2005
    #17
  18. Dec 20, 2005
    AKCJ

    AKCJ Active Member

    Fairbanks, Alaska
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    Aug 12, 2003
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    " . . . even reverting back to mechanical linkage if push comes to shove."

    that's good
     
    AKCJ, Dec 20, 2005
    #18
  19. Dec 20, 2005
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    Will get pics and measurements.... Yes – I is for sale (though I have not posted it yet). My wife and dog used all my jeep fund $$$ on medical things so I could use some $$$ for those opportunistic purchases that might pop into my lap (so to speak).

    It is available soup to nuts and I would like to sell the whole thing to someone. I will even dismantle as much as reasonable for shipping (Right Linc? :) ).
     
    Warloch, Dec 20, 2005
    #19
  20. Dec 22, 2005
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
    Joined:
    Mar 4, 2003
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    This tranny is stamped GM 6261886
    Input shaft @ 1 3/32Diam and see pics
    Output is a 26 tooth 6 spline and I have had an OD on it on the bench.

    The mount is on the adaptor (to the D 18 ) and it makes it work on the STANDARD crossmember. I just swapped it out and put the T 90 in - everything bolted back up.

    The bell housing has custom holes for mounting the tranny direct to it. Worked great, just wanted the T90 like all the others I have.
     
    Warloch, Dec 22, 2005
    #20
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