LSD differences?

[s14turbosilvia]

I recently purchased an LSD off of ebay that was locally owned. He claims that it is JDM and from an S13 chassis. Here are a few differences I noticed though:

1) it has 5-star output shafts, 300ZX?

2) when laid next to my stock open diff, the nose on the new LSD is roughly a half inch longer, requiring driveshaft shortening, but all subframe mounts seem to be in the correct places.

3) many different casting numbers on the new LSD, here are a few for somebody to crossreference with their pumpkins:

STOCK
Casting(top) "38311" "40F00"

Casting(bottom) "012" "018"

LSD
Casting(top) "38311" "40F10"

Casting(bottom) "013" "03"

I tried as hard as I could to make out the casting numbers on my open diff, used a wire brush and all, so I posted what I could. What I'm more concerned about is what car is my new LSD from? The first thing that pops into my head is either 300ZX or maybe an S14?

One more thing, on S13's, a VLSD was used, correct? And if it is VLSD, then it uses fluid friction to function, correct? So if the fluid is drained, then the two opposing output shafts should spin freely, right? I may be totally wrong here, i'm just taking an educated guess with this question. The reason I ask is because the output shafts of my new LSD are locked solid, you cannot spin them opposite of eachother at all. They will spin in the same direction, but not in opposite directions. Is this normal or has this unit been modified or locked up?

I know thats a lot of questions, but if somebody has any knowledge about this stuff or could point me in the right direction, I would really appreciate it.

Thanks, BEN

[Var]

long and short i dunno? maybe it was from a z32 TT.??? anyways. the fluid for the vlsd is sealed and doesnt use fluid from the rest of the diff.

[kazuo]

JDM S13 VLSDs have a 5 bolt pattern.

When you turn one shaft the other is supposed to spin the same way.

JDM driveshafts are an inch shorter than USDM driveshafts. I use a JDM S13 diff w/ USDM driveshaft without any issues.

[s14turbosilvia]

Okay, thanks guys a lot.
So am I looking for pre-95 J30 drive axles to mate with the diff and my stock hub splines?

[AKADriver]

not all JDM VLSDs are 5-star, and not all of them have 1" longer noses.

the longer nose is because of the ABS sensor. just like US-spec diffs. only some years/models used the 5-star output shafts.

[s14turbosilvia]

Originally Posted by kazuo

JDM S13 VLSDs have a 5 bolt pattern.

When you turn one shaft the other is supposed to spin the same way.

JDM driveshafts are an inch shorter than USDM driveshafts. I use a JDM S13 diff w/ USDM driveshaft without any issues.

Yes, but is your JDM VLSD ABS equipped or not? If so, then great, but if not, then I will keep asking questions.

[s14turbosilvia]

so do I have to source a driveshaft from a US-spec ABS 240?

[Ghettokracker71]

some LSD makes you go start sounding like Bubb Rubb,you know all "whoo whoo" and shit,while others..

[s14turbosilvia]

huh? ******

[Andrew Bohan]

i think 180s had 6 bolts and s13 silvias had 5 bolts...can anyone verify this?

[s14turbosilvia]

okay, I think I found my answer...
I have a 91-95 JDM S13 VLSD, 89-90 JDM (R)PS13's had the triangle output shafts. and the reason for the extra half inch in the nose of the pumpkin is the ABS sensor! Now I just need to know if my driveshaft requires shortening?

[rps13 SR]

if u look like 2 post after ur first u will find ur answer

[kazuo]

The VLSD did not come from a ABS car.

[s14turbosilvia]

Then I need to know if my driveshaft will require shortening, or will the bushings in there be enough to make room for an extra half inch?
-ben

[adey]

Driveshaft SHOULD be able to take up the slack, or so I'm led to believe. re: 5-bolt "star" axles- these aren't easy to source... unless you're getting a GREAT deal on the LSD, (read ~$100 or 150 range) I wouldn't bother. It'll likely cost you more time and almost as much money to source these axles.

Search the FAQ forum, this LSD stuff's been discussed inside out. No need to beat a dead horse.

[LadyS13]

Originally Posted by s14turbosilvia

STOCK
Casting(top) "38311" "40F00"

Casting(bottom) "012" "018"

I was curious what you ment by stock?? s13 stock or 300z. I am curious because I was given a LSD with those exact casting numbers however they didn't know where it came from or if it was a j30 or r200v/r200.. so if you knew which it was that would be a world of help, i'd love ya forever.

Thanks!

[omgRWDgoodness!]

If you're looking for some 5-bolt "star" output shafts, I have a pair from a 300ZX VLSD I could sell you...