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ZBUM's Nissan Z31 300ZX Differential Information Page All Z31s came with the R200 differential. Keep in mind that during crossover months (September) models may have either the listed ratio or the year prior. 84-87 NA = 3.7:1 open 88-89 NA = 3.9:1 open 84-86 T = 3.54:1 open 87 T = 3.7:1 open * 87-89 T = 3.7:1 clutch LSD * 88SS = 3.7:1 viscous LSD * The LSD came on the turbos made starting in March, 1987, with VIN number JN1CZ14S1HX152718. Before this, they were open differentials. Canada supposedly didn't get LSD until the 88 models. Differential Fluid Levels: R200 - 3-7/8 pt. (approx) open diff: API GL-5 clutch diff: API GL-5 and SAE 80W-90 approved for Nissan LSD Fluid Temperature Ratings: temps * weights below 50oF 75W below 86oF 80W below 104oF 75W-90 80W-90 between 14oF and 86oF 85W between 32oF and 104oF 90W above 50oF 140W * these are ambient air temperatures Differential swaps are common and very simple. Swapping any non viscous LSD into your open differential car only requires the differential. Depending on what year your driveshaft and differential are, you may have to swap companion flanges. There are only two differential companion flanges. The 84-86 models have a slightly offset bolt pattern (i.e. make a rectangle). The 87-89 models have a equal bolt pattern (i.e. make a square). Swapping companion flanges usually requires an impact gun. Swapping in the viscous LSD from an 88SS model is a bit more intensive. For all models, you will also need the half shafts. For 84-86 models, you will also need to swap the driveshaft companion flange. For non-turbo models, you will also need to swap the outer hubs in the control arms for turbo hubs. These differentials are indestructable, change the oil every year or two and you'll never have a problem. Nissan Motorsports sells complete ready to install R200 clutch LSDs for approximately $700-$1100 with your choice of standard R200 ratios. Phantom grip r200 installation procedure is here. Note: According to some owners, Phantom Grip sucks. Their recommendation is to splurge for an LSD. To tell if you have a differential, lift both rear tires off the ground and turn 1 wheel. If the opposite wheel turns the same direction then you have a LSD. If not, you have an open diff. The transmission should be in neutral for this.