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Z31 Differential Specifications and Variations

There were 11 different differentials offered in the Z31. They are all R200 models made by Hitachi (most likely). The differences are as follows:

Gear Sets Offered

| Model | Type | Ratio | Ring Gear / Pinion | Notes | |---|---|---|---|---| | USDM 300ZX 84-87 NA | R200 Open | 3.700:1 | 37T / 10T | | | USDM 300ZX 88-89 NA | R200 Open | 3.900:1 | 39T / 10T | | | USDM 300ZX 84-86 T & JDM 84-89 T | R200 Open | 3.545:1 | 39T / 11T | | | USDM 300ZX 87-89 T | R200 Clutch LSD* | 3.700:1 | 37T / 10T | | | USDM 300ZX 88SS | R200 Viscous LSD** | 3.700:1 | 37T / 10T | | | EURO 300ZX Turbo (Europe) | R200 Open | 3.364:1 | 37T / 11T | 4 spider gears | | EURO 300ZX Non-Turbo (Europe) | R200 Open | 3.700:1 | 37T / 10T | 2 spider gears | | EURO 300ZX Turbo (Europe) | R200 Open | 3.545:1 | 39T / 11T | 4 spider gears | | EURO 300ZX Turbo (Middle East) | R200 Open | 3.545:1 | 39T / 11T | 4 spider gears | | EURO 300ZX Non-Turbo (Middle East) | R200 Open | 3.700:1 | 37T / 10T | 4 spider gears | | EURO 300ZX Turbo (Elsewhere) | R200 Open | 3.545:1 | 39T / 11T | 2 spider gears | | EURO 300ZX Non-Turbo (Elsewhere) | R200 Open | 3.700:1 | 37T / 10T | 4 spider gears | | JDM 300ZX Manual | R200 Open | 3.545:1 | 39T / 11T | 2 spider gears | | JDM 200Z ZS ZG Manual & Auto | R200 Open | 4.111:1 | 37T / 9T | 2 spider gears | | JDM 200ZR Manual | R200 Viscous LSD | 4.375:1 | 35T / 8T | 4 spider gears | | JDM 200ZR Auto | R200 Viscous LSD | 4.625:1 | 37T / 8T | 4 spider gears | | JDM 300ZR Manual & Auto | R200 Clutch LSD | 4.111:1 | 37T / 9T | 4 spider gears |

• Clutch LSD | ** Viscous LSD

Additional Notes

USDM Cars Only:Only 87 Turbo cars produced after 04/87 were equipped with LSD. Earlier models had open differentials. Canada did not receive LSD until the 1988 model year.USDM Cars Only:The 1988 Shiro Special was the only model to feature the viscous LSD from factory.LSD Identification:Factory-equipped LSD units typically came with a finned rear differential cover, making it an easy visual identifier on USDM Z31s.EURO Market Models:European-market cars came with an external differential oil cooler from the factory. This system included an electric pump, oil cooler, fluid lines, and a temperature switch.

Driveshaft/Differential Yoke/Flange Differences

There were two different yokes used on the Z31 models depending on the production year:

Early Models:Featured a rectangular flange and bolt pattern.Late Models:Came with a circular flange and square bolt pattern.


Diff Fluid Recommendations (USDM)

R200 Capacity:3-7/8 pt.Open Diff:API GL-5Clutch LSD:API GL-5, SAE 80W-90 approved for Nissan LSDViscous LSD:API GL-5, SAE 80W-90

Diff Fluid Recommendations (EURO)

| Location of Sale | Oil Capacity (Liters / IMP PT) | Oil Type | |---|---|---| | Europe | 2.1 (3 3/4) | API GL-5 | | Middle East | 1.8 (3 1/8) | API GL-5 | | Other | 1.3 (2 1/4) | API GL-5 |

Sources Used

• 1984-1989 Nissan 300ZX USDM Factory Service Manual
• EURO Market Nissan 300ZX Factory Service Manual- 1984 Nissan Fairlady Z Product Brochure
• 1987 Nissan Fairlady Z Product Brochure