j30 differential

[nissan~240sx]

i have a nissan 240sx 93'. i want to get into drifting and in order to do that i need LSD. now, would a j30 lsd fit on the 240sx? which is cheaper? more effective? is the diff 1 way or 2 way?

[gr8scott72]

i have a nissan 240sx 93'. i want to get into drifting and in order to do that i need LSD. now, would a j30 lsd fit on the 240sx? which is cheaper? more effective? is the diff 1 way or 2 way?

Yes the J30's rear diff will fit. You just need to find one with the same bolt pattern as your car on the output shafts. The 95 and 96 year model J's have the same as yours as do some of the 94 year model J's. (My 94's is the same as the 240's)

You ask which is cheaper but only talk about the J30's rear diff so what are you wanting us to compair it to?

I don't know if it's one way or two. It's a viscous LSD. I don't think they rate them as one way or two way. Here's a clip I found on wikipedia:

The viscous type is generally simpler, and relies on the properties of a dilatant fluid - that is, one which thickens when subject to shear. Silicone-based oils are often used. Here, a cylindrical chamber of fluid filled with a stack of perforated discs rotates with the normal motion of the output shafts. The inside surface of the chamber is coupled to one of the driveshafts, and the outside coupled to the differential carrier. Half of the discs are connected to the inner, the other half to the outer, they alternate inner/outer in the stack. Differential motion forces the interlocked (though untouching) discs to move through the fluid against each other. The greater the relative speed of the discs, the more resistance the fluid will put up to oppose this motion. In contrast to the mechanical type, the limiting action is much softer and more proportional to the slip, so for the average driver is easier to cope with.

[nissan~240sx]

sorry bout that. comparing it to a nismo 2-way

[gr8scott72]

sorry bout that. comparing it to a nismo 2-way

Well you can pick up the J30 rear diff for about $200-$300 or so from a junk yard or ebay so you tell me.

[nissan~240sx]

so the j30 is def. cheaper but will a viscous lsd perform poorly? i looked up another definiton and it sounds like it doesn't work too well. it says that it may lose power and sometimes go into open diff. do u think i'll have to worry bout that while drifting?

[gr8scott72]

so the j30 is def. cheaper but will a viscous lsd perform poorly? i looked up another definiton and it sounds like it doesn't work too well. it says that it may lose power and sometimes go into open diff. do u think i'll have to worry bout that while drifting?

186k miles on mine and it still hooks up.

[homeslicej2]

i have a nissan 240sx 93'. i want to get into drifting and in order to do that i need LSD. now, would a j30 lsd fit on the 240sx? which is cheaper? more effective? is the diff 1 way or 2 way?

You were smart to ask this question in the J30/M30 forum. Ask this in the 240 forum and you'd get flamed so bad you'd probably never come back to the site. I'm glad you got your questions answered though, but next time also use the search button (as this has been discussed many times) and check the 240 technical articles as there is info on this swap there too. An LSD diff is excellent for drifting. The stock ones (such as a j30) eventually "wear" out and become useless, but this depends on service use and maintenance recieved (and power applied). Buying an aftermarket one (such as KAAZ or NISMO) will give you a new diff., but you have to change the fluid every 3 or 5k miles (can't remember which). Searching will provide you with more answers.

[yodawill2000]

The Viscous Fluid isnt replaced , its a sealed unit.Excessive use will wear out the LSD with a quickness. So Ive read anyways. Q45Tech post.He knows his stuff BIG TIME !!!

[homeslicej2]

^ah! I stand corrected. I used to have a firebird w/a limited slip but it was designed to be serviceable.

[yodawill2000]

I might add Q45Techs post was on the Q45 VSLD.Anybody know if the J is Sealed ??I might light it up more if I knew for sure

[devil6959]

Hey im looking for a J30 differential, if anyone has one that they would like to sell, please email me or post

[Defiant]

I might add Q45Techs post was on the Q45 VSLD.Anybody know if the J is Sealed ??

Yes, the viscous coupler is a sealed unit. I'm pretty sure all the viscous ones are.

[yodawill2000]

And aren't they prone to fail with extended use ?

[Defiant]

extended abuse will sure kill them, but otherwise they're pretty remarkable devices that'll put up with a lot of guff. The killer is overheating, especially if brought on by being forced to spin while trying to lock.

[Red Devil]

so there's no way to change the J30 diff fluid?

[gr8scott72]

so there's no way to change the J30 diff fluid?

Diff fluid, yes but not the viscous slip fluid.

[Red Devil]

So the actual viscous slip part is seperate from the rest of the unit and how much do you fill it when changing?
Modified by Red Devil at 3:11 PM 4/27/2008

[yodawill2000]

The LSD is sealed and you fill the Diff till it flows out the fill hole.Like any other diff.

[Kckouki]

Hate to bump this but im gonna.

What kind of diff. fluid do you guys use ?

[gr8scott72]

Hate to bump this but im gonna.

What kind of diff. fluid do you guys use ?

Mobile 1 gear oil