HKS 6-Speed Sequential Transmission – Mazda RX-7 FD3S
Experience the ultimate in drivetrain technology with the HKS 6-Speed Sequential Gearbox. Specifically engineered for the Mazda RX-7 FD3S and its high-revving 13B-REW powerplant, this transmission replaces the standard H-pattern with a rapid-fire sequential shift mechanism. This is a true racing transmission, designed to minimize shift times and maintain maximum boost pressure between gears, giving you a decisive edge on the track.
Key Features & Performance
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Lightning-Fast Sequential Shifting: Features a dedicated sequential cam drum for instantaneous upshifts and downshifts without the risk of a “money shift.”
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Dog Engagement Design: Utilizing heavy-duty dog rings instead of synchromesh, this gearbox thrives under the brutal loads of a high-power rotary engine.
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Optimized Gear Ratios: Comes with HKS-standard ratios designed to keep the 13B-REW in its optimal power band, eliminating the “dead spots” found in factory gearing.
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Direct Bolt-On Engineering: Unlike universal race boxes, this HKS unit is designed with the FD3S chassis in mind, requiring minimal modification to the transmission tunnel for installation.
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High Strength & Durability: Housed in a specially designed, reinforced case to handle significantly higher torque loads than the OEM Mazda gearbox.
Technical Specifications
| Feature | Details |
| Manufacturer | HKS (Japan) |
| Transmission Type | 6-Speed Sequential (Dog Box) |
| Compatibility | Mazda RX-7 FD3S (13B-REW / 20B) |
| Input Shaft | Strengthened for High Torque Applications |
| Condition | Near-New / Inspected JDM Component |
| Shift Pattern | Sequential (Pull Back = Upshift / Push Forward = Downshift) |
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