rear diff oil ???????????????????????

4x4tolland Feb 25, 2018

  1. 4x4tolland

    4x4tolland Test Drive

    Hi all, still trying to find out PROPER rear diff oil to use in my 04 X.... standard gear oil with no limited slip additive or oil with limited slip additive ??? Seems like this would be simple buttttttttt no. How does one figure out if the truck is equiped with limited slip rear end????????? The truck has a HG 49 axle which is supposed to equate to whats also know as a HB223 . which to my admitted limited understanding = 4.9 gears. Ok great :( still dont know if this is limited slip rear end or not. Yes i have jacked rear end up and put truck in neutral and spun one wheel. while doing this wheels travel in opposite directions....told this would indicate no limited slip????? Howeverrrrrrrrrrrrr also told this is not necessarily a definite indicator of limited slip or not as there may not be enough torque on pinnion gear to turn wheels in same direction....HELPPPPPPPPPPPPPPPPPP !!!!!!!!!!!!!

    OMG any help here would be much appreciated.

    Have asked this on 1st gen X fourm < the silence is deafening
  2. JeffPro4x

    JeffPro4x Hot Pipe Moderator Supporting Member

    Glenside, PA
    If you have an lsd, you should have a sticker on the diff saying "lsd oil only" or something to that effect.
  3. Prime

    Prime Some Kind of In Charge? Admin

    That's the only way to tell. A little orange sticker on the diff.

    As far as oil, get Mobil 1 75w90. It is LSD rated and will cover you both ways.
    J Everett likes this.
  4. kirk

    kirk Will get you lost in S. Dallas Supporting Member

    Allen, Texas
    What he said. I used the Mobil 1 and was happy with it.
  5. Bklyn.X

    Bklyn.X Need Bigger Tires Supporting Member Founding Member

    Brooklyn, NY
    For your 1st gen;

    Place your X in "Park" if it’s AT, in first gear if a manual.

    Chock the front tires.

    Parking brake off.

    Lift the back two tires off the ground.

    Turn one of the lifted wheels slowly by hand.

    LSD will be hard to turn, open diff will turn freely.

    Place your truck neutral.

    Turn one of the lifted wheels slowly by hand.

    LSD will turn more freely and the other rear tire will turn in the same direction, open diff the other rear tire will turn in the opposite direction.

    I used Mobil 1 Synthetic Gear Lube LS 75W-90 for my LSD equipped 2001 for years without issue.

    Just some info; the factory spec for the 2000-02 Xterra h233b LSD is 138-180 ft-lbs. of breakaway torque. The 2003 and 2004 is 29-43 ft-lb. breakaway torque. Sorry...
    Last edited: Feb 27, 2018

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