RV6 Performance Upgraded Helical 4th Gear for FK8 Type R

RV6 Performance Upgraded Helical 4th Gear for FK8 Type R

Harness every ounce of K20C1 power without fearing the shift into the notorious weak spot—this RV6 Performance upgraded helical 4th gear for FK8 Type R replaces the factory cog with a race-proven, torque-hungry alternative built to thrive under 700+ whp drag launches, road-course heat cycles, and daily-driver abuse alike.

Why it matters

• Track-bred strength – Three years of endurance-race development yielded a lower tooth count, enlarged tooth profile, and wider contact patch that disperse shock loads and multiply torque capacity far beyond OEM limits.
• Quiet, OE-like operation – Precision-cut helical geometry keeps cabin noise civil while maintaining smooth, crisp engagement.
• Direct drop-in fit – Machined from aerospace-grade steel and hard-finished to OE tolerances, it mates seamlessly with the stock countershaft and synchro hub—no guessing, no machining.
• Future-proof your build – Whether you’re adding bigger turbos, ethanol blends, or full bolt-ons, this 4th gear eliminates the transmission failure that sidelines most high-power FK8s, so you can keep climbing the dyno chart with confidence.

Fitment

2017-2021 Honda Civic Type R (FK8 chassis) 6-speed manual transmission.

Installation Snapshot

Advanced DIY or professional; 3-4 hrs with trans out; includes 4th gear only (reuse OEM synchro & hardware); no tuning or case cutting required.