so someone is selling me an lsd, and i want to buy it since my GTU didn't come with one. The dude is going to send me pictures tomorrow but they question i have is how can i tell if an lsd is good or not. Obviously i can tell if it is welded or not but is there anything i should look out for? Thanks

 

is it a S5 lsd or a S4,
If its a S5 the only lsd comes from the turbo and the 89-90 GTUs.
If you look at the pumpkin from the driveshaft side at the front of the diff, the ridges at the top of a LSD unit goes higher then the non lsd unit, it looks more beefier.

There was a picture showing the difference between a lsd pumpkin and a non lsd one. I cant seem to remember where I saw the pics.

 

its an S5 LSD from an GTU's
but how can i check if the lsd is good
its already taken out of the rear end
its just the LSD unit by itself

 

Its a viscous type so its not like the clutches could be bad in it.

 

clutches cant go bad in it because there is no clutches

WIth a Viscous LSD you cant tell if its bad or not from looking at it, unless there is a broken seal or something that leaks out the fluid that in it. THe fluid in it is suppose to be sealed in the unit. The thing that goes bad with viscous lsd is the fluid, and you cant replace the fluid. Atleast thats what I heard.

 

so here are the pictures of the lsd he sent me




is there anything wrong with it?
should i ask him to open it up and send me a picture of the actual unit?

 

That doesn't look anything like my s5 NA rear end. It also has a fill hole for the fluid which the NA doesnt. The back also looks very different.

It looks like the pinion seal is leaking that looks like the only thing wrong, I'd change that before you put it in the car.

 

do you have the na LSD in your car?

 

can someone send me a link showing the differences between the lsd rear end and the non lsd rear end?

Black Knight RX7 FC3S did you happen to find it?

 

cant find the picture.....and I just remembered that it was a comaprison between a turbo diff and a n/a diff lol
sorry about that.

You cant actually tell if its a lsd diff from looking at it as far as I know. Youd have to actually look at the lsd unit itself inside.

 

that is kind of the problem i am buying it from someone
and they can't really take it apart

 

he doesn't really have to take it apart. Just have him take the rear cover off and send a picture of the inside.

also, I would try to find a clutch style if you can. They seem to work better than viscous