I was browsing around and found this, which something similar should work for the 350Z diff. Cheap way for you VLSD guys that dislike the performance to upgrade. http://www.d1nz.com/forum/viewtopic....02feca5536d17e

 

It's a good tip, but the shim should only be installed after you've checked tolerances.

There are some kids out there putting 2 or 3 shims in there and all thats going to do is add crazy wear, most of them are drifters and don't care if they have to constantly replace their diffs/housings.

The other thing to look at doing is moving to a different diff fluid like the Torco or KAAZ.