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Oil Type For Transmission/transfer Case And Differentials

Discussion in 'Intermediate CJ-5/6/7/8' started by jason mays, Aug 12, 2017.

  1. jason mays

    jason mays New Member

    Fellas,

    Just wondering what kind of oil I can use for transmission/transfer case and differentials. I've read that GL-5 type oil in the tranny can be hard on the brass parts but it's all I can find in the parts stores. My manual for this 1970 CJ-5 calls for GL-4 in the tranny and transfer case. Also, the diff's call for MIL-L-2105B. Does anyone know where to find these oils or know of viable substitutes?

    Thanks in advance
     
    jason mays, Aug 12, 2017
    #1
  2. Scott G.

    Scott G. Sponsor

    Scott G., Aug 12, 2017
    #2
  3. PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    I buy Sta-lube GL-4 on Amazon. No big deal. Don't use GL-5 even when the parts guy tells you it is "the same."

    Search the archives here - they include many discussions on the topic. Tractor web forums, too.
     
    PeteL, Aug 12, 2017
    #3
  4. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    You can use the GL-5 in the axles. No problem. I suggest GL-4 for the transmission/transfer case.
     
    timgr, Aug 12, 2017
    #4
  5. Mr. Polecat

    Mr. Polecat New Member

    I use whatever generic brand of 90-weight gear oil is in the 55 gallon drum in the barn, Pennzoil I think........ In the TCs, axles, and manual gearboxes of everything that has them, regardless of the season.

    Seems to work fine. :p
     
    Mr. Polecat, Aug 12, 2017
    #5
    Daryl likes this.
  6. jason mays

    jason mays New Member

    Thanks a lot guys. This forum is great!
     
    jason mays, Aug 13, 2017
    #6