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Thread: Np 231j transfer case question.

  1. #1
    Join Date
    Apr 2014
    Location
    Jasper,GA
    Posts
    45

    Default Np 231j transfer case question.

    Alright this weekend the T-case and both differentials are getting new fluid. Question is what are you guys running in your T-case?. I'm sure bout what I'm gonna use in the front and rear, but I'm not clear on what the transfer case calls for??? Any suggestions or what the OEM calls for. Thanks
    "If you do, I will"

  2. #2
    Join Date
    Apr 2014
    Location
    Jasper,GA
    Posts
    45

    Default Re: Np 231j transfer case question.

    33 views and nobody can tell me what fluid my transfer case needs??? What if I say please
    "If you do, I will"

  3. #3
    Join Date
    May 2014
    Location
    Exeter, CA
    Posts
    73

    Default Re: Np 231j transfer case question.

    Calls for ATF in there. I once bought a rebuilt 231 and the re-builder insisted I use Delo 30W or Delo 15W-40 motor oil in his rebuilt case. That was required for his warranty.

    I've now run it in 231's for years and it works great, runs quiet and does't tend to leak as much.
    Last edited by slipinkramer; 06-05-2014 at 07:19 PM.
    It's called a Cherokee in Venezuela...

  4. #4
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: Np 231j transfer case question.

    ATF is what the factory calls for
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  5. #5
    Join Date
    Oct 2011
    Location
    S.E. Texas
    Posts
    29,260

    Default Re: Np 231j transfer case question.

    I used the extra atf that I had left over from the transmission fluid and filter change. That's how I planned so I bought extra Dexron III.

    Btw, the views get exaggerated by other sources like google. Not the best way to explain it but the best I got...

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