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

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
 

Prime

Shut up Baby, I know it!
Admin
Location
Denver Adjacent
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.
 

Bklyn.X

Skid Plates
Moderator
Supporting Member
Founding Member
Location
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...
 
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