i think my diff is broken

[rsx84]

took the car for a spin yesterday, just for the hell of it, before taking it to the electrican, had a mate in the car so i dumped it and its started to spin the passenger side wheel then knocked it into second still spinning but changed to the drivers side wheel spinning?? i'll put up a pic of the black lines as its even funny to look at.. anyone know while this would happen???

Cheers Matt.... dam it was good to drive her again...

[0HR-30T]

Not so much "broken",as the LSD's buggerd.

[Abo Bob]

Stop gap might be to put some Redline Lightweight Shockproof in it. Should help it stick better. Could try Superlight for even better if you like.

[V8skylineMAN]

its been sitting a while, right?

flog it a bit then change the oil...the plates are prolly seized and have only let go on one side....it should free up... but if it doesnt....u need a rebuild.

[rsx84]

also another thing is that when i have the car off the ground and spin the wheels by hand one will spin one way and the other will spin the other?? the cars at the auto electrican at the moment which is across the road from my machanics which is were the car is going next, swapping over the rear calipars and hand brake set up so i'll get him to change the diff oil to one of the ones above then too. thanks for ya help

[Doctor 30]

what oil do you use (other than regular gearbox oil)?

[MicK51]

isn't the actual clutch plates in there own seperate viscuous oil that is sealed? If so then changing the oil won't make any difference.

[Abo Bob]

rsx84 - That's the way it's supposed to spin.

Mick51 - No.

[V8skylineMAN]

what oil do you use (other than regular gearbox oil)?

You dont use regular gearbox oil in Lsd's....they have a different oil in them to open wheeling diffs.

[Doctor 30]

and what would that oil be? (Brands?)

[V8skylineMAN]

Same brands as any oil you would use in a open wheeler diff....just that they formulate it specifically(sp?) for lsd's

Same deal as engine oils....different formulas and viscosities for different applications.

[strutto]

isn't the actual clutch plates in there own seperate viscuous oil that is sealed? If so then changing the oil won't make any difference.

In a viscous diff, which the 33 GTS25'ts and probably the 32 GTSt's use, this is correct...

[0HR-30T]

Actually,there isn't any clutch plates in a viscous diff.......is there?

[strutto]

I don't think so... I could be wrong though... But for the purposes of this argument, Mick is right in saying the viscous unit of a viscous LSD is sealed and seperate from the diff oil...

[Abo Bob]

I've never pulled apart a viscous LSD so I don't know about a searate fluid but I put Redline Lightweight Shockproof in my diff which is technically a gear box fluid and I can report a definite improvement.

[strutto]

IIRC the 34's use a helical LSD which would benefit from a good LSD diff oil Sarpi...

[PTR33]

Mechanical LSD's need LSD oil, Viscous LSD's use regular diff oil.

[StuiE]

rsx84 - That's the way it's supposed to spin.

 

I always thought an open wheeler should spin the other way, but a LSD they should both go the same way, at least for a clutch type LSD.

[V8skylineMAN]

Open wheeling diffs will spin the other side wheel the other way when car is jacked up.....clutch pack type(plate) Lsd's will do the same just a little bit until the lsd unit kicks in(which is like 1/10th of a turn- not much) if the plates are not working properly like in RSX84's case, it will operate exactly like an open wheeler. because the slip is not limited.....this is assuming that his is a clutch type Lsd.

If it is viscous, then im unsure how it works but my understanding is the the oil in the viscous unit is forced thru little valves in the unit thereby causing both wheels to turn because the oil does not freely flow.......so i dont know how it would act in a jacked up situation because you wont be able to exert enough force by hand to make it work correctly.....

I know what I meant but I dont know if I have made it clear...

[Doctor 30]

So is it worth changing the oil if the diff freely spins like a single spinner when jacked up or is that a sign it is definitely rooted?