The Top Fuel Final Gear Set lowers the final gear ratio, improving acceleration performance and smoothing out the transitions between gears. When driving on a racetrack, gear ratio becomes an issue. Since the standard model is designed for city driving and highways, the gear ratio is inevitably somewhat high. Therefore, by lowering the final gear ratio, the top speed will decrease, but conversely, acceleration performance will improve and the transitions between gears will become smoother. In particular, with a V-TEC mechanism like in Honda cars, it becomes less likely that you'll encounter situations in tight corners where "in second gear you lose V-TEC, but in first gear it's jerky and difficult to control". Unlike typical final gears that are repurposed from other vehicles, these are newly manufactured products specifically for each vehicle model.
Features
- Normally, for EG series Civics and EK4s, the 4.785 final gear from the DC2 98 spec is often used, but this requires modifications to the ring gear, countershaft, first gear, and differential assembly. However, the Top Fuel 4.785 final gear kit is not a DC2 repurposed part, allowing for direct bolt-on installation.
- New final gear for S660/JW5 now available!
- Completely bolt-on installation, with a gear ratio of 5.416 compared to the stock 4.875.
- A high-gear 6-speed set is also available for the S660. Please contact us directly for inquiries.
- WPC treatment and DLC coating are available at an additional cost.
Notes
- Considering the balance between cost and effectiveness, WPC treatment alone is usually recommended. (DLC coating is also effective for pinion shafts in FR vehicles.)
- Please note that the delivery time will be longer than usual if you request WPC treatment and DLC coating.
- Only the gear portion of the pinion shaft will be treated.
- This product is for manual transmission (M/T) vehicles only. It cannot be used with automatic transmission (A/T) vehicles.
We ship to the United States and 150 other countries.
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Top Fuel is a tuning and maintenance shop in Matsusaka, Mie Prefecture, founded in August 1984. Top Fuel became a limited company in 1989 and a joint-stock company in 1995, and has run from its current shop since December 1995, working on Japanese cars only.
Top Fuel develops and makes its own parts: Hi-Per ROM engine computer tuning for the Suzuki Swift Sport, a dry carbon hardtop and swan-neck GT wing for the Honda S660, and a racing downpipe and sport springs for the Civic Type R FL5. Top Fuel also sets up engine computers, builds competition cars and complete engines, and runs a yearly series of track days at Suzuka Twin Circuit and Motorland Suzuka.
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About NENGUN
Since the year 2000, NENGUN has supplied over 500,000 parts direct from Fukuoka, Japan to 170 countries worldwide. If you have any questions, our experienced and friendly customer service team is always happy to help, please send us an enquiry.










