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The OS Giken close-ratio gear kit for Mazda RX-7 FC3S with the 13B-T engine is a five-speed transmission kit supplied with an input shaft. Intended to alter gear spacing for closer ratios, this kit targets drivers seeking tighter shifts in the five-speed gearbox. The product description identifies application to the RX-7 FC3S 13BT five-speed transmission; use and compatibility should be confirmed against vehicle details before purchase.
OS Giken Mazda RX7 FC3S 13BT 5 Speed Close Ratio Gear Kit w/ Input Shaft
