S15 LSD question that needs an answer

[DarkRaptor42]

I need an LSD and saw the s15 LSDs on Ebay. What I want to know is if that will just drop into my S13 pumpkin or what Id have to do to make it fit. My cars like a week away from going in to get painted so im picking up parts now for when it gets out. As always your replies are appreciated.

[Steeles]

It depends on what kind of diffs you are getting
> and starting with.
> For instance, the stock open diff uses two identical
> output flanges,
> while the VLSD unit uses a shorter one on one side.
> Some aftermarket
> diffs are made to drop into the open diff, while
> others the vlsd.
>
>  As for the helical unit from an S15, in short, it
> won't work.
> (guessing you are eyeballing the ones on ebay) The
> S13/S14 output
> flange's spline shafts are a smaller diameter. S15
> output flanges
> (which aren't even included) won't bolt to your
> axles anyway. I'm
> currently trying to verify the possibility of using
> old Skyline
> output shafts which are relatively cheap/easy to
> get, I just can't
> get a straight answer. Failing that, I'll probably
> end up buying S15
> flanges (cha-ching) and machining/welding them.
>
>  You'll need something to smear on the ring gear to
> make sure it's
> meshing correctly (I used spray paint but don't
> recommend it), and
> if it doesn't, you'll need a thicker or thinner
> shim.

this lesson brought to you by Tony from atlanta after his research into the matter <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'>

[mbmbmb23]

Dont use the spray paint.....you can buy a yellow grease tube from the GM parts department. &nbsp;That works well...if you know how to interpret the lash marks the pinon gear leaves on the diff gears. &nbsp;My advice to you is to take the pumpkin and the LSD into a tranny/gear shop....and have them shim match if for you.


-m

[tys240]

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Steeles @ Nov. 21 2002,09:50)</td></tr><tr><td id="QUOTE">

As for the helical unit from an S15, in short, it
won't work. (guessing you are eyeballing the ones on ebay) The S13/S14 output flange's spline shafts are a smaller diameter. S15 &nbsp;output flanges (which aren't even included) won't bolt to your axles anyway. I'm currently trying to verify the possibility of using old Skyline output shafts which are relatively cheap/easy to get, I just can't get a straight answer. Failing that, I'll probably end up buying S15
flanges (cha-ching) and machining/welding them.

You'll need something to smear on the ring gear to
make sure it's meshing correctly (I used spray paint but don't
recommend it), and if it doesn't, you'll need a thicker or thinner shim.

this lesson brought to you by Tony from atlanta after his research into the matter <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/smile.gif" border="0" valign="absmiddle" alt=':)'></td></tr></table><span id='postcolor'>
Actually,

The S15 pumpkin WILL bolt onto the S14 axles--they're identical.

I wouldn't get one of these HLDs on eBay unless it included the pumkin/casing--they never do...

-ty