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ok lets start the myth busting. No you cannot use a 300zx TT aka R230v diff in our cars. It is physically larger. It has a constant velocity style input to driveshaft connection. The half shafts and output shafts are larger, the ring and pinion is larger. Just get the whole concept out of your head unless your Monster Garage!
OK that out of the way. Now lets move on to the Q45 diff. It has the same kind of input/driveshaft connection. It also has larger output shafts. In a word its not worth the trouble. Yes its 3.54:1 geared because its sitting behind a fricken V8 aka torque out the ass.
You don't want a 3:54 gear in your car unless your putting out upwards of 350 ftlbs of torque and even then you would probably be unhappy with your off the line acceleration.
300zx TT's came with 3:69 aka 3:70:1 ratios because they were turboed and for the American market. We have and do more freeway driving. In a turbo setup a higher gear aka numerically lower gear is advantageous for staying in boost. Though if the engine rev's you could still use a lower gear aka numerically higher like a 3:90 or 4.08 or 4:11 and rip off the line but stay in boost. The skyline's were setup this way. Most people would have expected them to come with a 3:70 or 3:90 though Nissan put 4:08's in the GTST's and 4:11's in the GTRs. That is because RB's do rev nicely.
J30's came with 3:90's and that is a good choice if your looking to go a little more freeway aka top end on your gears.
CA18det powered 180sx's came with 4:36:1 gears because they lacked torque. Some drifters like those gear for the shear in the rev band immediatly that happens.
Now after all this what the hell are you trying to do with your? How much power do you have? Do you know what your trying to achieve?
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