How does a Viscous LSD(VLSD) work?
each output shaft of the differential is tied together by a device known as a viscous coupling. This is basically two slotted discs that have a silicon fluid between them. If the discs are rotated at a speed that varies relative to each other this produces friction which heats the silicon fluid up. The silicon becomes more viscous as it’s temprature rises. There will be a point where the silicon will become viscous enough to hold the two discs together (this is why the discs are slotted, it is so the silicon will have something to grip to). Where do I get a VLSD to put in my 240sx? By far the easiest and most inexpensive way would be to find a VLSD from a 240. I’m not sure but I believe the differential housing is the same for all model years of the 240sx. Another solution would be to get a differential from a 90+ 300zx. This is more expensive but they are easier to find. If you decide to use a differential from a 300zx be sure that it is from a ’90+ model naturally aspirated one and N
