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Gear Oil

Discussion in 'Early CJ5 and CJ6 Tech' started by bjames, Sep 11, 2006.

  1. Sep 11, 2006
    bjames

    bjames New Member

    Joined:
    Aug 29, 2006
    Messages:
    19
    Can Anyone Tell Me What Weight And Brand Of Gear Oil I Should Use In My T-90 And Dana 18 From A 61 Cj5, I Live In Arkansas So It Will See Hot Summer Days And Cold Freezing Winters
    Thanks For Your Time Guys Your A Great Help For Young Guys Like Me Trying To Get Into The Sport
     
    bjames, Sep 11, 2006
    #1
  2. Sep 11, 2006
    Mcruff

    Mcruff Earlycj5 Machinist

    Albertville, AL
    Joined:
    Sep 22, 2002
    Messages:
    5,349
    80-90wt gear oil.
     
    Mcruff, Sep 11, 2006
    #2
  3. Sep 11, 2006
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
    Joined:
    Sep 10, 2003
    Messages:
    2,084
    I run 85w90 in the axles and 85w140 in the tranny/transfer. But I don't run my jeep in winter (much).
     
    66cj5, Sep 11, 2006
    #3
  4. Sep 11, 2006
    kiowamtp

    kiowamtp Member

    DFW
    Joined:
    Dec 24, 2004
    Messages:
    618
    I ran 85w140 and when I got to CO that was way to thick in my opinion last winter. I am using 85w90 now.
     
    kiowamtp, Sep 11, 2006
    #4
  5. Sep 11, 2006
    toolbox

    toolbox If you get bored, I've got the projects.

    Hamilton, Montana
    Joined:
    Jul 27, 2006
    Messages:
    347
    I've noticed that in really cold weather regular 90W gear old turns to goo so bad you can really feel it. Synthetic gear oil seems to be far less affected by the cold. OTOH, it's really expensive...and if you've got the "perma drip" it might not be worth it. :oops: . There was one winter when I was in high school driving my VW bug that it was so cold the engine would stall when I let the clutch out...because the gear oil was too thick! I changed to sythetic and it worked ok. Still didn't have heat, but at least the car would move. :rofl:
     
    toolbox, Sep 11, 2006
    #5
  6. Sep 12, 2006
    Sledgehammer

    Sledgehammer Sure, I'll try it

    Ellery, Il
    Joined:
    Jun 7, 2006
    Messages:
    341
    I run 80-90 in axles, tranny, and t-case. Bought a bucket of Valvoline ($ouch$ :shock:) . It is great oil but with drips and such next time I'll buy the cheap stuff.
     
    Sledgehammer, Sep 12, 2006
    #6
  7. Sep 12, 2006
    sparky

    sparky Sandgroper Staff Member Founder

    Perth, WA
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    Sep 20, 2002
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    9,221
    sparky, Sep 12, 2006
    #7
  8. Sep 12, 2006
    bjames

    bjames New Member

    Joined:
    Aug 29, 2006
    Messages:
    19
    dana 18 /t-90

    Can anyone tell me how much gear oil in quarts that the dana 18 and t-90 will hold together? I have to order gl-4 oil and i dont know how much to order
    thanks for any help:flag:
     
    bjames, Sep 12, 2006
    #8
  9. Sep 12, 2006
    66cj5

    66cj5 Jeep with no name

    NorthWest Indiana
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    Sep 10, 2003
    Messages:
    2,084
    Re: dana 18 /t-90

    would guess about a gallon and a 1/2. better off having some extra to top off the tranny/transfer with.
     
    66cj5, Sep 12, 2006
    #9
  10. Sep 12, 2006
    Bruce Hamilton

    Bruce Hamilton oldjeeps

    West Newbury, MA
    Joined:
    Feb 8, 2003
    Messages:
    204
    I'm using 90-140 and my syncro's have been a little sticky. The tranny was almost empty when i finally got oil in it in June. I'm wondering whether i damaged the syncros because of the low oil level or the oil is too thick. Any thoughts?
     
    Bruce Hamilton, Sep 12, 2006
    #10
  11. Sep 13, 2006
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    Sep 20, 2002
    Messages:
    3,437
    140 is OK for diffs, works well with lockrights to quiet them down.
    Trannys are generally designed for 90 wt, and work best with 90 wt.
    Especially in your area Bruce, it's way too cold in the winter for 140 in your tranny. I'd drain and refill yours. You might even consider going to Redline Synthetic... many guys have said minor "sticking" problems disappear after running Redline...
     
    lynn, Sep 13, 2006
    #11
  12. Sep 18, 2006
    Bruce Hamilton

    Bruce Hamilton oldjeeps

    West Newbury, MA
    Joined:
    Feb 8, 2003
    Messages:
    204
    I changed my trans and transfer case lube from 90-140 back to 80-90 and my syncros are acting more like they should. I can't imagine what it would have been like in January. thanks
     
    Bruce Hamilton, Sep 18, 2006
    #12
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