What is a close ratio gear kit and why would I want one?

A close ratio gear kit changes the spacing between your transmission's gears. This allows the engine to stay closer to its optimal powerband during acceleration, leading to quicker shifts and improved overall performance, especially for track driving or spirited road use.

Does this kit include everything needed for the gear change?

This OS Giken kit includes the close ratio gears and a new input shaft. However, transmission disassembly and reassembly require additional parts like seals, gaskets, and potentially bearings. It's recommended to consult a professional for a complete parts list and installation.

What is the installation process like for this gear kit?

Installing a close ratio gear kit involves completely disassembling the transmission. This is a complex job that requires specialized tools and knowledge of transmission internals. Professional installation by an experienced mechanic is highly recommended.

1993-1995 Mazda RX-7 Close Ratio Gear Kit

Name: OS Giken Mazda RX7 FD3S 13BT 5 Speed Close Ratio Gear Kit w/ Input Shaft
Brand: OS Giken
SKU: os-giken-os-giken-mazda-rx7-fd3s-13bt-5-speed-close-ratio-gear-kit-w-input-shaft-t14-4382203
Price: 3352.32 USD
Availability: BackOrder

OS Giken Mazda RX7 FD3S 13BT 5 Speed Close Ratio Gear Kit w/ Input Shaft

$3352.32

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Fits 1993-1995 Mazda RX-7. OS Giken 5-speed close ratio gear kit with input shaft for improved acceleration.

Key Features

Fits 1993-1995 Mazda RX-7.
Designed for the 13BT engine and 5-speed manual transmission.
Features close ratio gearing for improved acceleration.
Includes a new input shaft for a more complete upgrade.
From OS Giken, a well-known name in performance drivetrain parts.

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Product Details

If you're looking to get more out of your 1993-1995 Mazda RX-7's transmission, this close ratio gear kit from OS Giken is a solid choice. This kit is designed specifically for the FD3S chassis with the 13BT engine and its 5-speed manual gearbox. By changing the gear ratios, you can achieve improved acceleration and keep the engine in its powerband more effectively during spirited driving or track use.

OS Giken is well-known for its performance drivetrain components, and this gear kit is no exception. It includes a new input shaft along with the carefully selected gear ratios. This means you're getting a more complete package for your transmission rebuild or upgrade. The close ratio design means the difference between each gear is smaller, allowing for quicker shifts and better use of the rotary engine's unique power delivery. This kit is a significant upgrade for anyone serious about maximizing their RX-7's performance on the street or track.

Installing a gear kit like this is a complex job that requires transmission disassembly. It's recommended to have a professional mechanic with experience in performance transmissions handle the installation. Ensure you have all the necessary tools and a clean workspace before beginning. This kit is a substantial investment in your RX-7's performance, offering a noticeable change in how the car accelerates and handles.