Split Case Gearing Thoughts

Discussion in '40- & 55-Series Tech' started by AlaskanWheeler, Jul 21, 2005.

  1. AlaskanWheeler

    AlaskanWheeler SILVER Star

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    I'm trying to solve some gearing solutions with my '81 on 38's. Running with 5.29 R&P is out of the question. If I run 4.88 with a 3.01:1 gear set such as MAN-A-FRE which has a high range of 1.08:1. Would this put me in the same ballpark as running 5.29 R&P gear sets? What are your opinions on running this set-up and has anybody had any troubles with these gear sets?
    Thanks
     
  2. VTFJ40

    VTFJ40

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  3. wesintl

    wesintl

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    speaking of split cases which ones came with the 2.2 low?
     
  4. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    85 and later...iirc...
     
  5. wesintl

    wesintl

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    does it coincide with the larger idler or no?
     
  6. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    The only 'drawback' if there is one with these Marks gear sets is that material from the inside of the tcase needs to be removed/sanded down, so that the gears clear. Not that big of a deal to me when I installed them in a 1983-40 series....


    It would improve your gearing and make your truck more drivable on road, as well as off.

    :beer:


    Good luck!


    -Steve
     
  7. Poser

    Poser Oh...Durka Durka Durka. s-Moderator Supporting Vendor

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    pretty sure that it does...


    you could look at cluster gear sets on SOR's site and possibly come up with an exact date...




    :beer:
     
  8. Josie'sLandCruiser

    Josie'sLandCruiser Stop calling it a "FJ."

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    Hi All:

    It is my understanding that the early 'split t-cases (1981-84 US-spec FJ60) had the 2.28 to 1 low range reduction, whilest the later US-Spec FJ60s (1985-87) came with the 1.96 to 1 low range ratio.

    Regards,

    Alan
    Seattle
     
  9. Exiled

    Exiled

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    As I understand it, *all* US-spec split cases mated to the H42 are 2.276:1, and those mated to Canadian-spec H55Fs are 1.99:1.

    Mine for sure is 1.99:1 and it's got the larger (38mm) idler. My truck is a '91 and came stock with an H55F.
     
  10. Cruiserdrew

    Cruiserdrew On the way there SILVER Star

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    We all have different "understandings" but I'm pretty sure this is correct:

    1.99:1, 34mm idler through the end of the 84 model year-9/84

    2.26:1, 34mm idler 10/84-3/86

    2.26:1, 38mm idler 4/86-end of 87 model year, manual shift

    2.26:1, 38mm idler 88-89 model year, vacuum shift (and different shift forks inside)
     
  11. FJ40Jim

    FJ40Jim The Cruiser Whisperer SILVER Star

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    This coincides with every split case w/ H42 or H55 that I have counted so far. The catalog does show a slightly different idler tooth count for4/86 and later, but there is one part number (and tooth count) for all E-3/86 USA split cases. I may not have counted teeth on a 4/86-later H42 T-case, so cannot comment on the ratio of those units.
     
  12. wesintl

    wesintl

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    THanks. I've searched and every thread comes up with differing assumptions just like this one and it's hard to decipher what is correct. I have a 34mm idler and I want to get a used case to rebuild and I might as well get the 2.276 with the larger 38mm idler but then I loose the ability case parts which I guess it negligable.Thanks Jim, Henry.
     
  13. PVCruiser

    PVCruiser

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    I've got a split case apart right now from an '84 with a 34 mm idler out of an H42. I can count it this afternoon and report back.... Now I just need to figure out which two gears to count :doh:
     
  14. FJ40Jim

    FJ40Jim The Cruiser Whisperer SILVER Star

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    First, count the input gear and the front idler.
    Then, count the back idler and the low output gear.
    :banana:

    Now divide front idler by input.
    Divide low output by rear idler.
    :banana: :banana:

    Multiply the 2 results together.
    :banana: :banana: :banana:

    Hopefully you will end up with a number like 1.99 or 2.28 :bounce:
     
  15. Mike S

    Mike S

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    My '87 60 has the split case with 2.29:1 and 38mm idler.

    M
     
  16. DaveWest5150

    DaveWest5150

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    I have the Marks gearset and I am happy with the performance, however... they do make a bit of noise. (It sounds like a ok 3 speed transfer case.) If you are used to the quietness of a split case
    forget it. Dave
     
  17. PVCruiser

    PVCruiser

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    Hey Jim-
    Thanks for the info. I will check next friday when I have access to my T-case and report back.


    Seth
     
  18. erics

    erics

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    85 fj60 case

    here's the innards of a split case from an oct 85 fj60

    by trying to eyeball and count half the teeth and using Jim's formula I end up right around 2.28:1

    my eyes aren't good enough to eyball plus or minus 2mm on the idler shaft
     
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