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Transfer Case Gearing reduction ??

Discussion in 'Early CJ5 and CJ6 Tech' started by weedy, Sep 15, 2006.

  1. Sep 15, 2006
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
    Messages:
    156
    I have a 1964 CJ-5 with a 134, 3 sped, twin stick transfer case and 4.27 gears. What is the gear reduction when the transfer case id put in LOW?
    A Rubicon is 4:1 reduced and I was thinking my drop was not that dramatic.:?
     
    weedy, Sep 15, 2006
    #1
  2. Sep 15, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
    Joined:
    Sep 20, 2002
    Messages:
    3,437
    John, low range in the Dana 18 transfer case is 2.46:1

    So your crawl ratio is 2.98 x 2.46 x 4.27 = 31.30
     
    lynn, Sep 15, 2006
    #2
  3. Sep 15, 2006
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
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    156
    That explains why this underpowered 4cyl jeep climbs like a mountain goat.
     
    weedy, Sep 15, 2006
    #3
  4. Sep 15, 2006
    JeepsRcool

    JeepsRcool Member

    Garden Grove, CA
    Joined:
    Aug 31, 2006
    Messages:
    128
    yeah my ratio is sad i got t86 d18 and 3.73 its 26:1 :cry:
    but i can go 80 before i hit 3000rpms:v6:
    not that that matters....
     
    JeepsRcool, Sep 15, 2006
    #4
  5. Sep 15, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
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    5,349
    Mine with a t14 is only slightly better at 28.4:1, but with my sm420 to be installed in about 3 months it should shoot up to 64:1.:)
     
    Mcruff, Sep 15, 2006
    #5
  6. Sep 15, 2006
    weedy

    weedy Member

    Conroe, Tx
    Joined:
    Apr 19, 2005
    Messages:
    156
    My top end is about 55 - 60 mph. 50 mph is the safest with the drum brakes.
     
    weedy, Sep 15, 2006
    #6
  7. Sep 15, 2006
    vajeeper

    vajeeper Member

    Blackstone Va
    Joined:
    Oct 7, 2005
    Messages:
    130
    ...Is that what happened to the body on the jeep in your avatar? :)

    I certainly wouldn't want to go that fast in my jeep...body probably would fall off
     
    vajeeper, Sep 15, 2006
    #7
  8. Sep 15, 2006
    Hawk62cj5

    Hawk62cj5 Captain of OldSchool

    Brodnax Va.
    Joined:
    Oct 28, 2004
    Messages:
    694
    Thats why I cant wait for the time when I get my T98 in , 84:1 Baby.
     
    Hawk62cj5, Sep 15, 2006
    #8
  9. Sep 15, 2006
    coby61

    coby61 Stupidiotic Member

    Prunedale CA
    Joined:
    Mar 10, 2004
    Messages:
    388
    6.55 x 2.46 x 5.38 = 86.6:1 :twisted:
    That should be enough when I am done! :)
     
    coby61, Sep 15, 2006
    #9
  10. Sep 15, 2006
    MountainJeep

    MountainJeep Ringmaster, Circus Crew

    Centennial, Colorado
    Joined:
    May 9, 2006
    Messages:
    224
    6.55x4.3x4.56 = 128:1

    overkill? perhaps, but it will be nice that have that kind of throttle control at super slow speeds on the rocks
     
    MountainJeep, Sep 15, 2006
    #10
  11. Sep 15, 2006
    Corveeper

    Corveeper Member

    Chanute, Kansas
    Joined:
    Jul 29, 2005
    Messages:
    817
    7.06 X 2.46 X 4.27 = 74.2

    You’ll like that SM420. 8) :driving:
     
    Corveeper, Sep 15, 2006
    #11
  12. Sep 15, 2006
    TexColorado

    TexColorado Member

    Reno, NV
    Joined:
    Sep 13, 2005
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    167
    TexColorado, Sep 15, 2006
    #12
  13. Sep 15, 2006
    MOP

    MOP Active Member

    Pullman, WA
    Joined:
    Sep 25, 2003
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    1,131
    This is making me rethink things a bit.....

    currently: 36:1

    with teralow: 46:1 (that might be about all I would want for $600 or less)

    with sm420: 84:1 (might be overkill 97% of the time for my wants, but with my OD the gearing choices would be pretty sweet, cost?, but probably well over $600 and closer to $900 by the time it is all said and done)
     
    MOP, Sep 15, 2006
    #13
  14. Sep 15, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
    Joined:
    Sep 20, 2002
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    9,221
    W/ the Terralow is where my TJ was. That was pretty nice.

    SM420 would put me where I want to be. OTOH, I've had a lot of fun even without it. :)
     
    sparky, Sep 15, 2006
    #14
  15. Sep 15, 2006
    Boyink

    Boyink Super Moderator Staff Member

    Tulsa, OK
    Joined:
    Sep 20, 2002
    Messages:
    6,197
    SSDutch is at ~66:1 with the T18. I haven't played much in the rocks but not sure I'd want to go any lower - especially at the cost of top end. I'd still like an OD with the 4.27's.

    I just wish the dang reverse wasn't so low -- I can skip 1st gear going forward, but I can put the clutch in and coast out of my driveway quicker than doing it under power. It'd suck to plow with...
     
    Boyink, Sep 15, 2006
    #15
  16. Sep 16, 2006
    CI CJ

    CI CJ New Member

    Merlin, Or
    Joined:
    Oct 28, 2003
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    12
    just finished a t86 to sm420 swap: you are gona love it.....

    ci
     
    CI CJ, Sep 16, 2006
    #16
  17. Sep 16, 2006
    scott milliner

    scott milliner Master Fabricator

    Seattle Wa.
    Joined:
    Dec 17, 2002
    Messages:
    2,362
    6.55 x 2.46 x 5.38 = 86.6

    First time I did mine.:shock:
     
    scott milliner, Sep 16, 2006
    #17
  18. Sep 16, 2006
    TexColorado

    TexColorado Member

    Reno, NV
    Joined:
    Sep 13, 2005
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    167
    I believe lower is better. Back in a different life I owned a heavily modified Toyota 4Runner. The crawl ratio on that was 128:1 with the help of Marlin Crawler. To be honest I hardly ever used the 1st gear in low range.

    5.15 x 5.29 x 4.70 = 128. I think now I am the same as Millner above me.
     
    TexColorado, Sep 16, 2006
    #18
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