OS Giken 6-Speed Close Ratio Gear Kit | 2003-2006 Nissan 350Z (NS111-GD)

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6-Speed Close Ratio Gear Kit by OS Giken

Performance driving and high output engines puts strain on the drivetrain and can sometimes lead to failing components, such as broken gears or input shafts. The goal of the OS Giken Close Ratio Gear Kit is to reinforce the transmission internal components while maximizing an engines potential by providing custom gear ratios for performance driving.

Each OS Giken gear component is designed and created from high-quality forged materials, and then undergoes hard shot peening, resulting in increased strength and durability. Furthermore, the gears are helical-cut, rather than straight-cut, to maintain a quiet and smooth operation, accomplishing full comfort for street driving as well as reliability for racing.


  • High Quality Forged Materials
  • Undergoes Hard Shot Peening
  • Gears Are Helical-Cut
  • Strength and Durability
  • Quiet and Smooth Operation

Please Note: A generic image was used for this product, and it may not accurately represent what you will receive.


  • 2003 - 2006 Nissan 350Z

Gear Ratios

  • 1st Gear: 2.996
  • 2nd Gear: 1.961
  • 3rd Gear: 1.507
  • 4th Gear: 1.217
  • 5th Gear: 1.000
  • 6th Gear: 0.812

What's In The Box?

  • 1 - 6spd Close Ratio Gear Kit


  • Manufacturer's Warranty

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