J30 VLSD Question

[Xmax]

I found a J30 at a local junkyard and the VLSD is still intact. My question is that since all of J30s come with VLSD I tried testing to see if the VLSD was still working by turning the drive shaft, no engine and tranny, but only one wheel spun, is it worth still picking this up while its still there? Unless there has been rare J30s with an open diff instead of VLSD. Or is the VLSD malfuctioned. I'm sure this question has been asked, but I can't seem to find the answer. Thanks.

[UNISA JECS]

Testing a VLSD requires you to put the car in neutral and then both wheels will spin in teh same direction if its good, if you leave the vehicle in gear and try this you will get both wheels spinning in opposite directions, but if the vehicle has a stuck caliper to rotor testing the car in neutral may lead to a false test and appear to be bad.

*This ofcourse applies to a vehicle that raised of the ground.

[Xmax]

But there is no tranny connected to the driveshaft and I turned the driveshaft by hand and only one wheel spun.

[UNISA JECS]

But there is no tranny connected to the driveshaft and I turned the driveshaft by hand and only one wheel spun.

Then make sure the last part of my statement isn't true before rulling it bad.

[Xmax]

Oh ok.... I should of read you statement a little bit better. Hopefully when I go back this weekend and if its still there, I'll try testing it again. thanks.

[Sir]

Unless there has been rare J30s with an open diff instead of VLSD.
all J30s have VLSD
it may be just shot to hell.
you could always shim it.

[mrpeepers]

I thought VLSD's work when enough friction was generated in the viscosity of the fluid, hence VLSD? I don't think that turning the shaft slowly won't create enough friction for the fluid to act on both shafts

I could be soooo totally wrong, i am taking this from the top of my head. Feel free to correct me anyone

[UNISA JECS]

I thought VLSD's work when enough friction was generated in the viscosity of the fluid, hence VLSD? I don't think that turning the shaft slowly won't create enough friction for the fluid to act on both shafts

I could be soooo totally wrong, i am taking this from the top of my head. Feel free to correct me anyone

You are correct but in the case of testing with teh vehicle raised of teh ground this is why it needs to be out of gear, if you tested and open diff of the ground out of gear both wheels would spin in the opposite direction right off teh bat. But to test the VLSD in gear would require alot of wheel spin before you could make teh other side lock and spin together with teh opposite side.

[mrpeepers]

ahh thanks for the knowledge

[onepuff]

How does the diff know when you are in gear as opposed to neutral?

[UNISA JECS]

How does the diff know when you are in gear as opposed to neutral?

Because when the transmission is in gear there is now a load place on the diffrential.