Are all S13 diffs LSD's?
 

I have bought a diff from a 1989 180SX will it be an LSD and how do I tell before I start taking it to bits? I read the spec list for the cars and it said they do have a viscous LSD??? HELP !

usually they have a yellow sticker on them that says vlsd, they earlly s13's din't have a lsd i don't think.:confused:

No Sticker
 

I can't find a sticker on it at all. Can I tell if I remove the end casing?

Oil Cooler
 

It does have an oil cooler with it so this would indicate it is a vlsd????? why would you need an oil cooler on a non lsd?

Try turning the shafts in opposite directions.

An LSD is almost impossible to turn in opposite directions.

Took apart
 

Just took the end casing off, can turn shafts in opposite direction quite easily but why would it have an oil cooler on it and does an lsd look any different inside to a non lsd??

Its an early one
 

Its off a 1989 G 180SX S13 so one of the very first ones. Any numbers anywhere to give me a clue as I am going no further if it isn't suitable.

http://is.rely.net/3-99-7263-l-gwZK9...15uRqvi8Wg.jpg

That's an open diff, if it looks like that you don't have an LSD.

Its off a 200sx turbo
 

How stupid am I , its off a 200sx 1.8 Turbo. Is it a LSD ????? HELP

Looks like that
 

It looks exactly like the one in the photo, so I've just paid £80 and a round trip of 150 miles for no reason. Bugger

Ouch, did they sell it to you as an LSD? Was it a Fleabay jobbit?

looks like this
 

can I have your e:mail coz this site won't let me post up pictures under any circumstances. I have a couple of pictures of the internals of mine and it looks slightly different as in you can't see the internal gears on mine as there is a casing around them??

You can't see the internal gears that easily on the S13 LSD regardless of whether it has an LSD or not.

You need to host your pics in a site like photobucket to post them here.

If you can turn the left and right shafts in opposite directions easily than you unfortunately have an open diff.

I think it is an LSD
 

Yes it is an LSD, hold the prop shaft end solid hold 1 driveshaft side and the other shouldn't turn freely, if it does turn freely its not an LSD. If it turns with resistance it's an LSD. Turning opposite sides means nothing.

Turning opposite sides does mean something. If they're very tight to turn in opposite directions it's an LSD.

The only LSD which turns like an open diff and is nearly undetectable by hand unless you look without the cover is a helical type LSD.

We think you know nothing
 

So what is a quaif A.T.B. Diff then???? !!!

Thats a helical type diff.

I do know something thanks. If you want advice, then don't say 'we think you know nothing'.

I have an S15 helical diff and S13 LSD so I have a fairly good idea what I'm talking about

?
 

So if you can jack up a sierra 2wd cosworth and turn one wheel the other will turn in the opposite direction and they all have LSD's as standard. Whereas if the car is in gear leave one back wheel on the ground jack the other wheel up it will turn but there will be lots of resistance coz it has an LSD

Sierra's have viscous LSD's like the S13. Unless the LSD is fucked they wouldn't behave like that.

My shitty old Xantia will have a locked wheel if you leave it in gear and only jack one side.

pic
 

the picture posted by jackiefan shows that the internals look different to mine it has the plates around the outside of the planet gears. The one in the picture shows the planet gears visible, mine can't be seen for the plates??

He's shown you an S12 diff thats why it looks different.

All you can see from memory of inside is very little as there are only 4 holes of about 1.5" diameter to see inside with

Drive shaft
 

On the diagram you posted showing the S13 inners into S12 casing you used the drivers side inner cup from the S13 would using the S12 original drive shaft work if the splines were machined to take the circlip and maybe shortened or do you definately have to use a short passenger side S12 drive shaft onto the drivers side, the best bit is both my drive shafts measure 10" so which is the short one????

Actually I didn't, that's an S13 open diff.

30psi is right though, if you can turn the two output shafts in opposite directions without breaking a sweat then it's unlikely that you have one of the standard S13 vLSDs. Or if you do, it's not working very well.

The photo you sent me last night doesn't look like either the standard open diff that I've seen or the Standard vLSD.

http://i109.photobucket.com/albums/n...818lsd0018.jpg

Try popping the output shafts and comparing them, send me photo if you like and we might be able to better guess what you've ended up with.

The drive shafts should be two different lengths (about 2" difference) unless your car was already retro-fitted with an LSD and then they might measure the same, however 10" seems too short but that's only from memory.

http://img.photobucket.com/albums/v2...monster321.jpg
http://img.photobucket.com/albums/v2...monster323.jpg
http://img.photobucket.com/albums/v2...monster322.jpg
as you can see the shaft at the bottom is the shorter passenger side, but when they are in the diff you can't tell the difference.

Are they two short ones Shaun?

EDIT - I remember the difference being more obvious than that.

no mate, top one next to the blue trim is longer.