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Transfer case and Tranny OIL?

Discussion in 'Flat Fender Tech' started by Andy4802, Sep 29, 2006.

  1. Andy4802

    Andy4802 Canadian Jeep junkie

    guys im installing my clutch tomorrow and i want to change the fluids in the transmission and transfer case whil im at it. I've got the stock 90/18 combo. Do any of you know what kind of oil i should be putting in either one?
     
    Andy4802, Sep 29, 2006
    #1
  2. lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    75/90 wt gear oil. Since you're in the great white north, you shouldn't use anything thicker. :)
     
    lynn, Sep 29, 2006
    #2
  3. Andy4802

    Andy4802 Canadian Jeep junkie

    for both?
     
    Andy4802, Sep 29, 2006
    #3
  4. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Yes. A gear driven transfer case uses gear oil.
     
    timgr, Sep 29, 2006
    #4
  5. Andy4802

    Andy4802 Canadian Jeep junkie

    thank you!
     
    Andy4802, Sep 29, 2006
    #5
  6. Andy4802

    Andy4802 Canadian Jeep junkie

    ok stupid question... how much do they hold?
     
    Andy4802, Sep 29, 2006
    #6
  7. Goose

    Goose New Member

    I think the spec on the 18 is 3 quarts. I don't know about the 90. Just keep putting oil in them till they start to overflow the fill plug. If you have an overdrive, you are supposed to run it for a while both in direct and in overdrive and then check the transfer case, it may take a little more (although I have never had add any).
     
    Goose, Sep 29, 2006
    #7
  8. BobFortier

    BobFortier Member

    Good luck with the clutch, hope this works !


    Bob in Sherbrooke, also in the Great White North !!
     
    BobFortier, Sep 29, 2006
    #8
  9. w3srl

    w3srl All-around swell dude Staff Member

    Andy, you NEED to get yourself a good FSM as a reference tool. Not that we don't like having you post questions, but the FSM is an INDISPENSIBLE tool for rebuilding, restoring, folding, spindling and well, everything else Jeep-related. I spent DAYS reserching and reading about projects that I was anticipating, and the guidance contained in the manual kept me on the straight and narrow, saving me beaucoup cash dollars in the process. You get the picture. :D
     
    w3srl, Sep 29, 2006
    #9
  10. Andy4802

    Andy4802 Canadian Jeep junkie

    Actually i already have the manual, but i find that 60 years of jeep building experience is often more valuable than whats in a manual. Sometimes there are a few "tricks" and tips that are definitely usefull from those that have been building jeeps for longer than i have...

    that is after all what these forums are for...
     
    Andy4802, Oct 1, 2006
    #10
  11. w3srl

    w3srl All-around swell dude Staff Member

    I didn't mean to come off harshly Andy, I'm sorry. All I meant to say is that for basic specs & such the FSM is the fist place I look.

    BTW- The $10 suction gun trick is the cat's meow! In order to make the 90-wt oil more "user friendly" I usually fill a 5-gallon bucket 1/2 full of straight hot tap water and then float the gear oil bottles in there until I'm ready to use them. Makes the oil flow a LOT more easily!
     
    w3srl, Oct 1, 2006
    #11
  12. Andy4802

    Andy4802 Canadian Jeep junkie

    No offence taken W3 :)
    hey that suction gun is a great idea! i dropped my tranny and t-case together so i had plenty of room to empty and fill them while they were down... but i'll use that trick next time.

    guys you would not believe the black ooze that came out of both cases... a cross between black tar and mollasses...
     
    Andy4802, Oct 1, 2006
    #12
  13. NoFlyZone

    NoFlyZone Member

    When I changed mine it looked like red Georgia clay. The gas looked like used oil and the whole thing ran and drove fine...
     
    NoFlyZone, Oct 2, 2006
    #13
  14. Boyink

    Boyink Super Moderator Staff Member

    Boyink, Oct 2, 2006
    #14
  15. Goose

    Goose New Member

    Are you sure that book says pints? There is a big diference between 3 pints and 3 quarts.
     
    Goose, Oct 2, 2006
    #15
  16. speedbuggy

    speedbuggy Looking for a Jeep now

    :iagree: I tried the grease-gun looking thing and it worked ok. The pump is a much cleaner way to supply the oil to the tranny. :)
     
    speedbuggy, Oct 2, 2006
    #16