Scout II fluids

Discussion in 'General IH Tech' started by Odmark, Jul 24, 2017.


  1. Odmark

    Odmark Farmall Cub

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    Hey guys! Ive been off of here for quite some time but now tomorrow im buying my old Scout II back for the third time :clap:

    Im going to replace all the fluids and i want to know whats what.

    First of all, it has the Dana 20 transfer case i believe (4L, N, 2H, 4H). Now my swedish manual says i should use Dexron ATF.
    I have drained the transfer case once before and it did actually have ATF in it, but i was told to put some 10w40 mineral engine oil in it so i did. (Wich quieted it down and made it not crunch while changin gears).
    But what should really be in it?

    Second: Differentials. Its a 75 so it has Dana 44 front and rear. Rear LSD.
    Will a SAE 80w90 trans oil do? With LSD additive for the rear?

    Thanks in advance :beer:
     
  2. MrKenmore

    MrKenmore High Wheeler

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    I just used this in the differential. Has additive for LSD.
    [​IMG]
     
  3. Mark Aycock

    Mark Aycock High Wheeler

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    I always used 50w racing oil for the Dana 20 transfer case.
     
  4. scoutboy74

    scoutboy74 Lives in an IH Dealership

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    90wt GL-1 mineral oil in the t-case. Single viscosity 50wt racing motor oil will also work there. ATF should never be in the t-case. ATF should only be in the auto transmission. GL-5 gear lube in the diffs with a tube of LS additive for the one with LS. Probably should just hang on to the Scout this time, huh?
     
  5. Odmark

    Odmark Farmall Cub

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    Thanks for the inputs guys! The Scout is home once again and the correct fluids are in the trunk.

    And yes this time i will hang on to it :angel:
     
  6. Odmark

    Odmark Farmall Cub

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    Whell this is odd, as i said this is the third time i bought this car back, in total i have owned it for about 4 years.

    It has ALWAYS spun both rear tires, i mean always. In snow, mud, even on asphalt. So i was 100% certain it was a limited slip axle.

    Today i was going to replace the fluid in the rear axle, and when i removed the diff cover i have an open differential :uhh:
     
  7. scoutboy74

    scoutboy74 Lives in an IH Dealership

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    Could the most recent previous owner have pulled a swaperooski?
     
  8. Odmark

    Odmark Farmall Cub

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    No, he just drove the car home and parked it in a barn, then it sat there for 2 years.
     
  9. Scott L

    Scott L High Wheeler

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    Car? What car?
     
  10. Odmark

    Odmark Farmall Cub

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    1975 Scout II
     
  11. Scott L

    Scott L High Wheeler

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    Sorry........... I was trying to subtly push you towards referring to it as a truck rather than a car.
     
  12. 3rd Gen Scout

    3rd Gen Scout Farmall Cub

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    Agreed, though according to my AZ title, my SII is a 4x4 station wagon. :no:
     
  13. Ron A

    Ron A High Wheeler

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    I think you are better off with an open diff than a 42 year old trac lok.
     
  14. Odmark

    Odmark Farmall Cub

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    Hahaha oh, my bad :clap::beer:

    Yeah it is what it is. I will probably just stuff a lunchbox locker in there later.
     
  15. Patrick Morris

    Patrick Morris Lives in an IH Dealership

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    Well, logically, the slogan "Anything else is just a car" doesn't actually exclude the Scout from also being a car. Just saying. :1eye:
     
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  16. BinderBookie

    BinderBookie High Wheeler

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    Believe it or not, there are certain circumstances when an open diff will do two wheel burnouts or spin both tires in a low traction situation:

    -If the traction torque (the amount of tire grip offered by the combination of the tire and the ground surface) is almost identical on both sides

    -The open diff has a mechanical problem and doesn't bias easily. I have seen this on diffs that use shims under the side gears and the shims have galled or the surfaces on the side gear or carrier are galled. Gear separation pushed the side gears hard into the case and with the rough surface acts like a lightly loaded clutch pack

    -If a really heavy lubricant is used, or it's very cold with a heavy lubricant, the open diff will be gummed up by the ice-cream like oil and not bias

    -Gear separation forces in the diff all alone can have a milt LS effect. Back in the late '50s, Land Rover offered a limited slip for a few years. It was nothing more than a friction disc placed behind the side gear and the diff gears were set up kinda tight. You got a very mild limited slip for a while with a tiny bit of preload. Once everything wore a little, the preload (what tiny amount was there) went away but the gear separation part still worked due to the friction surfaces on the disc. I did this for a guy years ago with a Dana 35. He had a machine ship and machined the back side of the side gears just enough to slip in one clutch disc on either side. He had a very mild limited slip essentially for free (I gave him a couple of clutch plates I had laying around). Never got to follow up, but it worked initially.
     
  17. Patrick Morris

    Patrick Morris Lives in an IH Dealership

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    You're sure it is an Open and not a Track-loc? Just asking because they're pretty similar looking superficially. I mean, the only way I'd know the difference is by the Open's "acorn" shape vs. the TL's cylindrical shape.


    [​IMG]
     
    Last edited: Jul 30, 2017
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  18. Odmark

    Odmark Farmall Cub

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    Oh i did not know a track lock looked like that, i have to check tomorrow. Its a good chance i have a track lock lol.

    Never encountered that type of locker, how does it work?
    And if i have one, what oil should i use?
     
  19. Odmark

    Odmark Farmall Cub

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    I do indeed have a trac-lok . :sweatdrop:

    So what oil? Does trac-lok still require limited slip additive? :cowboy:
     
  20. MrKenmore

    MrKenmore High Wheeler

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    The Pennzoil version I showed has the LSD additive included so maybe the GL-5 you find will have the same.
     

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