** Lsd info **

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** Lsd info **

Post  s14 on Tue Nov 04, 2008 4:42 pm

Nissan VLSDs that work in a 240sx and the modifications needed to bolt it in:

VLSD sourced from:

240SX with ABS
Modifications needed: None
Differential housing is ~.75" longer
4.083 Ratio

95-96 Infiniti J30
Modifications needed: None
Differential housing is ~.75" longer
3.916 Ratio

90-96 300ZX N/A
Need different output shafts or axles and longer front bolts
Can use '92-94 J30 axles -OR-
S13/S14 (or 95-96 J30) VLSD output shafts
4.083 Ratio

'92-94 Infinity J30
Need different output shafts or axles Can use '92-94 J30 axles -OR-
S13/S14 (or 95-96 J30) VLSD output shafts
Differential housing is ~.75" longer
3.916 Ratio

The differentials listed above are the easy, bolt-in options for 240SX owners. The Q45 diff, below...is much more application specific.

Basically, if you want to use a Q45 diff with the lower ratio...have a good reason:
+450rwhp, road racing for BIG courses, higher trap speed for drag racing (i.e. +140mph) etc...

VLSD sourced from:

'97-01 Q45
Need different axles... Should be able to use '92-94 J30 axles.
NOTE: Different VLSD output shafts are NOT an option...
...the spline count inside the diff is different.
3.54:1 or 3.69:1 ratio...

'90-94 Q45
Need different axles AND hubs - You'll need: (per Steve of S&M Racing)
'90-94 Q45 (or Z32 turbo) rear hubs (5-lug)
2 new axles: One from a turbo Z32, one from a Q45
PASS. side of your S13/S14 uses a DRIVERS side Q45 axle
DRIVERS side of your S13/S14 uses a DRIVERS side Z32 TT axle
Input/pinion flange is LARGER - Need a different driveshaft or flange



The M30 diff WILL NOT WORK because of the location of the diff mounting points.


Miscellaneous Notes:



If you own an S13 (89-94) you will need to swap the rear cover off your stock open diff onto the VLSD:

The S13 uses a different bolt pattern (4 bolts) than the S14 (2 bolts) on the rear cover...



You will also need 2 longer mounting bolts for the S13 chassis, and 2 large washers for the front mounts...to be used with the large bushings on the front mounts.

-Washers need to be ~1.5" diameter or so, and 1/8" thick.

The bolts are M12 X 1.25 thread/pitch, 85mm long.

The stock S13 front mounting bolts are not long enough for the J30 and S14 diff mounts.



To overcome the .75" extra length at the nose of the diff you can:

1) Install it and see if your driveshaft and tranny mounts have enough play to soak up the extra length.

2) Get a driveshaft from an ABS equipped 240SX...it's .75" inch shorter.

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LSD or not?

Post  reezn on Mon Dec 29, 2008 9:15 pm

My AUTO Zenki would act like it had an LSD 70% of the time. I could tell because sometimes it would lay down double stripes, and be very easy to handle sideway's and sometimes it wouldn't. I checked for a sticker, lifted it and turned one wheel. The other wheel did turn in the opposite direction, but I've heard that lifting it and turning the wheel doesn't alway's reveal if it has LSD, something about load? Heard anything about that? Question I know on the s13 if you look under the back fender and if the diff cover has vertical and horizontal fins/lines its LSD.
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Re: ** Lsd info **

Post  s14 on Mon Dec 29, 2008 9:54 pm

No clue, took that from another forum. lolz

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Re: ** Lsd info **

Post  ritz on Tue Dec 30, 2008 7:43 pm

hmm seems like i ahve to check my car when i get a chance.
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Re: ** Lsd info **

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