There is a DIY for how to change the diff fluid. No different than any other diff made 40 years ago. In fact the 370z is exactly the same as my 1977 280z; only difference is the amount and type of fluid used.
I would agree though that the fluid shouldn't be broken down at the mileage I'm at but I've read a few posts where people changed the tranny fluid or diff fluid prematurely and actually noticed smoother, crisper shifts as well as less vibration and noise. For the cost of the fluid and a little of my time I'm willing to give it a shot. Tires will be next but it just seems odd to get so much uncontrolled wheel spin from a car with so little torque vs. tire width. I mean tell me, does your 2011 Nismo go sideways when you launch it or does it stay straight and you take off no problem?
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