limited slip differential oil

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simon@vic

Joined
Mar 3, 2008
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1
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Location
australia for 2008 {canadain}
does any one know if i need special oil for a limited slip differential or do i just use 90w?
i have been reading some places its ok to use normal 90w, and it is not in other places.

the truck is a 1991 toyota landcruser 70 series troopie

also, would it have 2 LSDs or just one in the rear?

thx for any help!
 
Im fairly sure it would just be LSD in the back (However hopefully someone cleverer than I can give a confirm/deny on that) As for the fluid you "should" be able to use 90W just so long as you also use a friction additive...
 
You should use a gear oil that is rated for limited slip differentials, it'll say it on the bottle if it is rated for LSD's.
 
If your in oz ,Castrol LX90 LSD oil meets Toyotas specs and is widely available.

Is your troopy a diesel?
 
thanks fof the help! im in auz now for a year but at home {canada} there are almost no LSDs in trucks so we just use 90w gear oil from a bulk drum. i bought 5L of the castrol listed as LSD safe. thx

one more question how limmeted is a toyota lsd? ie, how much will the one tire spin befor the 2nd one kicks in.

thx again for the help!
 
simon@vic said:
one more question how limmeted is a toyota lsd? ie, how much will the one tire spin befor the 2nd one kicks in.

thx again for the help!
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Not much ,they are considered quite useless even when working.
I think theoffside wheel gets about 14% bias. Not enough to push it off a jack with the driive wheel off the ground.

Taking the troopie back home? You would have some admirers if you did :D
 
roscoFJ73 said:
Not much ,they are considered quite useless even when working.
I think theoffside wheel gets about 14% bias. Not enough to push it off a jack with the driive wheel off the ground.
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that isn't what i wanted to hear........... but i guess it is better then nothing............... good thing i got a winch.

so your saying only 14% of the total goes to the planted wheel? like 86% to the hanging wheel and 14% to the planted one?

or 100% to the hanging wheel and then 14% to the planted one....

i wans hoping it would be 100% to both sides when engaged....
 
I tried LS additive and never noticed a difference. From my experience the Toyota LSD is little to no improvement over a regular open diff. I even had mine modified (shimmed) by Crushers. Still very little difference if any.
 
simon@vic said:
that isn't what i wanted to hear........... but i guess it is better then nothing............... good thing i got a winch.

so your saying only 14% of the total goes to the planted wheel? like 86% to the hanging wheel and 14% to the planted one?

or 100% to the hanging wheel and then 14% to the planted one....

i wans hoping it would be 100% to both sides when engaged....
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86% to the rear lh and 14% to the rear rh. You can only have 100% total;)
Only a locker diff can give a true 50/50 split.

The landcruiser LSD is only there to keep one wheel from dragging .

You can tighten the diff cutches a little.
 
Rosco ..you are absolutely right about how effective or ineffective rather the toyota LSD is.

My LJ79 prado has an LSD...Was drivingon a riverbed once and noticed hardly any power transfer to the side with traction.

Was always wondering if thats how all of toyota's lsd's work or was it just mine.Good to know thats just the way they work.:D
 
JSYK......In case it might be simpler for you.....I understand that most fully synthetic gear oils are already LSD safe. Check the bottles. That's what I use. I don't know what's available on you're side of the world though. ;)
 
ALL TORQUE said:
Hi there. Am I able to use an LSD rated oil (LSX90) in my HZJ75 front diff? Or is there to much of a difference?
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I dont think it would hurt but it is more expensive than normal gear oil
 
a week ago I have found out that my FJ70 needs special LSD differential oil :whoops: because sometimes its was making a bad noise,

a year ago Ive change it with regular oil :meh:in differentials now Im wondering how far coed be damaged LSD thing in there after whole year daily driving (mostly in city) on regular diff oil????:bang:
 
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LSD additives only really help the clutches move more smoothly over one another. You might get some chattering without the additive.

in "trucks" in Canada, there are lots of LSDs used in domestics and some imports. You must be careful about your broad generalizations. There are not that many found in Land Cruisers, though they are out there.

Generally, a LSD is pretty useless for any kind of off-road driving (though there are a few who have tried to argue otherwise).

~John
 
VajaFJ70 said:
a week ago I have found out that my FJ70 needs special LSD differential oil :whoops: because sometimes its was making a bad noise,

a year ago Ive change it with regular oil :meh:in differentials now Im wondering how far coed be damaged LSD thing in there after whole year daily driving (mostly in city) on regular diff oil????:bang:
Click to expand...

If its been driven for any length of time without the correct oil,combined with the fact the diff is 20 years old,you can consider the LSD effect pretty well gone.
 
In my old 89 fj75 i pulled my open wheeler out as i was going to weld it to lock it as it was allways spining one whhel or the other and im pretty sure Aus cruiser utes come std with rear lsd in 90 or 91 so another reason i though i had a open wheeler
Pulled my diff out and ohh what do you know it allready has a lsd in , so thats how non functional my rear lsd was
 
A sort of test is to jack up the back wheels, handbrake off, and spin one of the wheels, they should spin the same direction.
Have someone hold the other wheel and see how much it binds before slipping, if its hard work your lsd is working good. if its easy to make it unbind, then its probably knackerd.

Just going by mine, that was like that when compared to a friends, I used to struggle to follow him up rutted tracks where cross axleing would occur. LSD was worn.
Now I have an ARB locker :)
 
I installed an LSD in the front axle of my '60. I can feel it on the manual steering when the hubs are locked.
 
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