Drivetrain› Manual Transmissions and Components

OS Giken

OS Giken Honda Civic EK4(9) DC2 B18/16A 3-Speed Close Ratio Gear Kit (3.077/1.600/1.261)

$1,190.00

SKU: O002 HA031-GA

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Special Order
Ships in 4–6 weeks
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Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Description

Part #: HA031-GA

MIA's Description

The OS Giken HA031-GA 3-Speed Close Ratio Gear Kit reinforces transmission internals and maximizes engine potential with custom gear ratios. It is made from high-quality forged materials and is hard shot peened for strength and durability. The helical-cut gears ensure quiet, smooth operation, making it suitable for both street and racing applications.

Fitment

Fitment Guaranteed

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Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

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Specifications

BrandOS Giken
Part NumberO002 HA031-GA

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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