Infiniti J30 LSD on my 240????

[Slappy]

Modified by Slappy at 10:28 PM 9/13/2007

[GhostDriver]

I think the early J30 diffs are a little different but the 95s are essentially the same as the 240sx/ z32. It's the typical vlsd that Nissan uses on most of their cars.Orions site is one of the most helpful sites I've been to in regards to LSDs.http://www.ka24development.com/vlsd.html

[Tulsa_S-13]

95-96 J30 LSD is a bolt on deal92-94 J30 LSD you have to use the J30 axles.

Both year models have a 3.916 ratio, whereas the VLSD off the 240sx and non-turbo 300zx uses a 4.083 ratio.

[GhostDriver]

The 95-96 units bolt should pop in so I'd grab one. The older ones are fine, I guess, if you have the axles. I personally am looking for one because they're basically the same as the 240sx diffs and might be easier to find.

[Tulsa_S-13]

I got my information straight from the same link you got yours fromhttp://www.ka24development.com/vlsd.html The 95-96 j30 differential is a bolt on deal with no modifications needed.

[naed240sx]

slappy-yes, the 6 bolt j30 will "bolt in", but it is not exactly the same dimensions. Since the j30 had abs, the diffs have an abs sensor up front, and are a bit longer than a typical s13 diff (by about 1/2 inch I think). There is some play in the drivetrain that allows you to fit it in by pushing the driveshaft towards the front of the car. Personally I would not go this route. It would put excess stress on the drivetrain and differential. And while I havent heard of anyone having any problmems, I wouldnt do it. Secondly, you are screwing yourself over with the gear ratio. It may give your car better gas mileage on the highway, but it will slow down your acceleration. I recently got one of the 4.4:1 silvia diffs in my car, and the quicker gearing was great... my car felt much quicker. After testing the locking capability howerver, I discovered that the viscous pack was pretty much blown, and it was acting very close to an open diff. The guy is gonna send me another one though... one from an r32 with the same ratio.

^Just some extra info for you.

The reason that it says the same diffs were used in those cars is because the internals are the same. Not neccearily the input length or outputs or gearing.

[grimple1]

I recently got one of the 4.4:1 silvia diffs in my car, and the quicker gearing was great....

Was that a direct bolt in? I've got a '95 240sx and the 4.4 sounds like a better solution than the 3. I keep seeing them for sale but shyed away b/c of fitment questions.

[naed240sx]

well yeah, it was from an s13, and I drive an s13. Its just what came standard in silvias in japan. But for s14s, the pumpkin would not fit. You could swap the internals though, which isnt too difficult. 4.4 ratio is the way to go. It didnt even seem like it put me at a much higher rpm cruising.

[onosqv]

That's true, unless you are going turbo - then I believe the 3.96 would help you since you can stay in boost longer while accelerating. I know turbo's typically like taller (lower numbers) gears.

The other thing about the j30, in the faq's, some people have problems, some don't. The ones that do end up messing up the carrier bearing I believe, and end up having to replace the entire driveshaft.

And is there a systematic method to "test" the quality of the vlsd ?

[naed240sx]

I dont think you could unless you had motors capable of putting loads on input/outputs. You can turn the output to see if it is a viscous, but as far as testing the holding capability or locking or whatever, you pretty much have to put it in. I put it in then realized it was pretty much busted. Check it out at:

zerothread?id=132243

[naed240sx]

btw, broke: what is the story on the transmission bypass module thing. Please tell.