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Speed Tek Auto Racing Nissan Skyline Silvia R200 3.90 Ratio Billet Differential Final Drive Gear Set 39:10

Speed Tek Auto Racing Nissan Skyline Silvia R200 3.90 Ratio Billet Differential Final Drive Gear Set 39:10

SKU:R200CWP390

Regular price $6,418.00
Regular price Sale price $6,418.00
(Duties & import taxes included)
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Isotropic Superfinishing

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The long-awaited Nissan R200 200mm 3.90 ratio differential final drive gear set fits most Nissan vehicles equipped with an R200 IRS differential.

Commonly found in the Nissan Skyline, Silvia, Cefiro, Laurel, and others.

The long ratio we have designed is ideal for high-power vehicles equipped with 6-speed transmissions, dual-clutch transmissions, or even 2-speed Powerglide automatics.

This unit has also undergone a special hardening process to ensure the gears last under extreme conditions. We recommend having this installed professionally.

We confirm that the crown wheel bolts fit 12x1.25mm pitch bolts. This is also compatible with 13mm limited-slip differentials. The locating points come from the machining of the LSD and crown wheel. Do not be afraid. 12mm bolts are used in a 13mm LSD. The bolts are only there for clamping. The precision of the machining of the LSD and crown wheel determines the "runout" of the LSD/gear.

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  • - Billet 8620 steel
  • - High-quality hypoid bevel gears
  • - 39-tooth crown wheel, 10-tooth pinion
  • - Wide gear tooth design for maximum torque/HP
  • - Compatible with GTR and GTST differentials
  • - Brand new gear set
  • - Easy to install

Do you need a specific ratio for your Nissan?

Send us a message. We may have what you need or want.


We can now offer isotropic superfinishing for all Speedtek products.
(This process will add time to the shipping of your kit. Please email us if you have any questions)

Superfinishing is a metalworking process that improves the surface finish and geometry of the workpiece. This is achieved by removing only the thin amorphous surface layer left by the final grinding process using grinding stones to polish gears and other parts. This layer is typically about 1 μm in size. Unlike polishing, which creates a mirror finish, superfinishing creates a cross-hatch pattern on the workpiece.

The benefits of superfinishing include: extended part life, reduced wear, tighter tolerances, increased load-bearing surface, improved sealing function, elimination of break-in periods, etc.