Ok guys, this is it………the 350z diff is officially installed into my 240sx.
The first thing to understand is that you will have to fabricate to get the diff into the car.
The test fit of the z33 diff into s14 subframe didn’t go well. As you can see in the picture below, the stock diff fit very well into the subframe.

This is the way the z33 diff fit into the stock s14 subframe. The location of the z33 diff input flange is about 1.5 to 2 inches away from where it should be and the bolts holes are 1 inch further apart than the s14.

Asyou can see, it needed to be about 1.5 inches closer to the subframe.
So, I cut and welded the s14 subframe to fit the z32 diff.


I cut out and used the stock nuts that were located inside the stock s14 diff.

Now the z33 diff is fitting into the s14 subframe perfectlly. What about the rear cover mounting point you ask? Well, the one mounting point on the z33 diff lines up perfectly with one of the rear s14 subframe mounts, so no modding necessary.

So, I installed the subframe back into the car and installed the z33 diff into the car to make sure everything fits. The diff fits perfectly, it clears the swaybar and ebrake cables. I am very happy with the location of the input flange.

I fit the driveshaft into the diff and as I had expected, the flange for the diff needs to be drilled to fit the smaller s14 driveshaft flange. The center of the driveshaft fits perfectly into the z33 diff input flange, so you just have to drill the smaller s14 bolt pattern, as seen in the picture.

The next step is to have custom axles made. I am doing custom axles, so I can get stronger ones for competition.