Yeah this is a fairly common problem. Sport Compact Car magazine had the same problem after just 1 powerslide in their project 350z. I think the problem is because they used the same diff. that they have been producing for years on other cars, without the right adjustments to handle the power that the Z cars put to the ground.
Anyway, heres the link where they talk about the stock diff.
http://www.sportcompactcarweb.com/pr...8scc_proj350z/
Good luck!
Threaded Mode