Helical LSD into S13

[BoroBoroS13]

I have done a search and couldnt find an exact parts needed list sooo...

Exactly what is needed for a S15 Helical LSD swap into a open diff S13?
Like what parts do you reuse from the S13 with an open diff, which parts would you need from a JDM S13 VLSD, and which parts do you need from a S15 HLSD.

I have read and heard a lot of different things and it has become a fat cloud of mistery now...

THX

[DuffMan]

It will swap in but you need s15 output flanges. No vlsd output flanges will work.

[hurleyboi514]

It will swap in but you need s15 output flanges. No vlsd output flanges will work.

is this a proven fact???

[addicted2sp33d]

is this a proven fact???

I swapped an S15 Helical into my S14 (originally with Open Diff), and used the original S14 output shafts because they were in better condition than the S15 output shafts (lots of rust on these).

Dunno if this would carry over to S13's... but no, S15 output shafts are not necessary, at least to swap into an S14.

[hurleyboi514]

I swapped an S15 Helical into my S14 (originally with Open Diff), and used the original S14 output shafts because they were in better condition than the S15 output shafts (lots of rust on these).

Dunno if this would carry over to S13's... but no, S15 output shafts are not necessary, at least to swap into an S14.

really??? thats cool...

[DuffMan]

I swapped an S15 Helical into my S14 (originally with Open Diff), and used the original S14 output shafts because they were in better condition than the S15 output shafts (lots of rust on these).

Dunno if this would carry over to S13's... but no, S15 output shafts are not necessary, at least to swap into an S14.

Shafts or flanges?

[thelinja]

I swapped an S15 Helical into my S14 (originally with Open Diff), and used the original S14 output shafts because they were in better condition than the S15 output shafts (lots of rust on these).

Dunno if this would carry over to S13's... but no, S15 output shafts are not necessary, at least to swap into an S14.
I think you're mistaken. I tried to use my open diff flanges when I installed my S15 HLSD last month and the open diff shafts didn't fit at all. I instead used the S15 shafts that came with the diff.

[BoroBoroS13]

Sooo, for an S13 your going to need the output shafts from a S15 and the HLSD. Anything else???

[thelinja]

nope, that's it as far as parts goes. You'll still need gear oil and RTV liquid gasket.

[addicted2sp33d]

I watched the diff-shop install it. The tech asked me which output shafts I wanted to use (S14 open, or S15), because my stock output shafts were in better shape than my S15 output shafts. At one point, all 4 of them were sitting on the work-bench together, and we simply picked the two that didn't have any rust on them.

As for the flanges, the S15 and S14's use the 6-bolt pattern... not sure about S13's... so if S13's use a 6-bolt pattern, it shouldn't be a problem.

In terms of parts, in order to use the S15 3.6 Final drive, you'll need to get the proper pinion gear also.

If you elect to keep the stock 4.1 Final drive, you'll need to either get the stock ring gear re-drilled to match the S15 ring-gear bolts, or you'll need to get spacers for the S14 bolts going through the Helical Diff itself.

[DuffMan]

You're not following us, we're saying you need to use the S15 output flanges. The axles dont matter.

[hurleyboi514]

stock is 4.1?? nice ill get a increase in accel!! i just bought the one on jspec.com, so i should have an S15 diff soon. im still not sure what im gonna have to use to put it in, but oh well... we'll see...

[phrozen]

why dont you ask dousan, iirc he did this swap

[hurleyboi514]

no he didnt, he's got a clutch pack. nismo i think. charles did the helical swap, but he used the output shafts it came with. either way, i bought a diff from jspec, and im gonna get it in the car somehow. i cant get a solid answer either way, so if it doesnt work in a open diff S13, ill try and open diff S14. if that doesnt work, ill try it in a S13 VLSD. if that doesnt work, ill get S15 output shafts (and probably pay with one of my nuts! :(). either way, i WILL have an S15 diff in my car! :)

[thelinja]

Hulrleyboi: the S15 HLSD fits in to the pumpkin for both S13s and S14s. I believe Sykikchimp had an open diff (correct me if I'm wrong) and he installed his. I had an open diff in my S14 and I installed mine (see image below) So I'm sure it will fit into either pumpkin.

Addicted2Speed : I still think you're mistaken considering you and I have the same situation here, I COULD NOT make the S14 open diff shafts work with the HLSD. Unless you forced it in somehow. Also, stock final drive is NOT 4.10, it's 4.08(S15 is 4.08 for automatics, and 3.69 for 6-speed) and you do not need to redrill the ring gear holes. I just used the ring gear bolts that came on the open diff. Trust me, I did all of this last month and got everything installed with the help of a friend and we both knew what we were doing and that was 50 days and 1500 miles ago. I want to hear someone else that has used because I'm not convinced and the ratio of people that say no to using S14 open output shafts to people who say you can use them is 400 : you.

[hurleyboi514]

yeah, i dont think the open diff output shafts would work, but as long as VLSD shafts work, its all good! :) woo hoo, helical here i come! it actually shipped out today...

[drift_newbie]

Okay,

I have a j30 vlsd in my car right now, but it has a bearing that is going in it, (whines horribly.)

I still have my stock open diff and pumpkin, (s13.)

If I buy the s15 helical, do I have all the parts I need to assemble a diff and pumpkin to put into my s13?

Thanks,

-Ben

[Var]

jspec.com sells the HLSD and this is what they say

"Internals only will require 2 side shaft from VLSD to work.
If you had to ask what's a helical LSD this is not for you.
$250 plus shipping"

[hurleyboi514]

jspec.com sells the HLSD and this is what they say

"Internals only will require 2 side shaft from VLSD to work.
If you had to ask what's a helical LSD this is not for you.
$250 plus shipping"


i already bought the HLSD on jspec, shipped this morning... :) i wonder if they have more? its cheeeeapp.... $250 shipped for a HLSD, what a deal...

[crioten]

makes you wonder if that price will stay the same...i hope it does, cuz dayum, thats cheaper than a stock VLSD in most cases

[Var]

it's cheaper but most ppl want clutch type or viscous cause most ppl would rather drift a 240 than road race it (hlsd is no good for drifting or drag racing)

just shows how demand affects pricing.. a more complicated and expensive part sells for cheaper than a vlsd just cause ppl want the vlsd.

[DuffMan]

that maybe cheap but I think they made a mistake saying it would work with a vlsd output flange. Maybe you could order the HLSD output flanges from a dealer, if you found a part number. Probably going to be annother 300 dollars at least, maybe more if they have to special order it. Maybe you could have the open diff ones machined to work.

[thelinja]

Damn, $250 is a steal for the HLSD!

Hurleyboi, I'm sure you'll be happy with the diff, but you might want to email Sam or call him to see if that's a typo on the ad. I'd like to get a verification on what output shafts can be used with the HLSD. Mine's already been installed for over a month, but I'm just interested to know.:p

[hurleyboi514]

well, i checked some aussie forums and it appears that they just bolt them into VLSD housings... im sure ill get it to work! :)

[crioten]

will they bolt into the open diff housings?

[thelinja]

the open diff housing is the same as the vlsd housing

If you had read one of my previous posts, your question would have been answered. :)

[DuffMan]

Ok there seems to be a lot of confusion and some misinformation in this thread, partially due to terminology.

1st:
Any R200 diff will fit in any other R200 HOUSING. So a S15 diff will fit into any us 240sx HOUSING. VLSD or open it doesnt matter. You can use your stock ring gear as well to keep the same gear ratio.

2nd:
The S15 diff uses 6 bolt SHAFTS. This means you can use your SHAFTS, and dont need different ones.

3rd The S15 diff uses a output FLANGE that is different. You cannot use your usdm FLANGE. You cannot use VLSD FLANGES for us or jdm cars. You may be able to use R33 flanges perhaps, since they are HLSD in some models but I have no idea if they are 6 bolt or not. You may also be able to machine a different flange to work. But you cannot use any S13 or S14 viscous or open diff flanges.

Lets try to keep the concepts of SHAFTS, HOUSINGS and FLANGES seperate to avoid the confusion. :bow:

[mrmephistopheles]

The differential shop that installed addicted2sp33d's diff reused his FLANGES (non-VLSD). But don't believe me, it's not like I was there or anything..





























Oh wait.











































I was. :eek3d:

[the240sxer95]

i am confused =p

[240Stilo]

What the hell is a flange when it comes to a differential? I thought the only thing to it was the housing, the internals, and the shafts (which have the 6 bolt pattern to bolt up to the axles).

[BadMoJo]

This thread makes me want to :bash:

[the240sxer95]

tell me about it =[ i did that already!

[mbmbmb23]

People keep throwing the word "flange" around. Let's get our terminology straight here first. There are 2 "flanges" per side on the differential, one is on the end of the output shaft, and the other is on the end of the axle that mates up to the output shaft.

So far we've had one person say VLSD output shafts work, and someone else say non- VLSD shaft work. Which is it?...they are different sizes so they can't both work.



-m

[the240sxer95]

^^ answer that guy

[TurboPowerPatje]

S13 non LSD

29.8mm x 29 splines, and tubular shaft 32mm, 97.4mm long
29.8mm x 29 splines, and tubular shaft 32mm, 105.6 long

S13 VLSD: o/s - 29.5mm x 29 splines, 129mm long n/s - 29.5mm x 29 splines, 85mm long
38220-41F01 left (open diff?)

S14 VLSD 29.5mm 29 splines (29 tooth and 29.87mm diameter)

S14A VLSD 30 spline (30 tooth and 30.87mm diameter)

S15 HLSD: 30 spine-30.75mm dia.
Part Number Right flange: 38220-29u00
Part Number Left Flange: 38220-29u01

[badbob2121]

almost 8 years old, i think this topic could have stayed in the grave yard... great 1st post

:picardfp: