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Kuku Performance | Listing Template
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OBX K-Series K20A2 K20Z3 6-Speed 3rd 4th Gear Set 1.150 0.909 4pc
OBX matched 4-piece 3rd / 4th gear set for compatible Honda and Acura K-Series 6-speed transmissions. This set uses a 1.150 3rd gear ratio and 0.909 4th gear ratio, giving K-Series builders a performance-oriented 3rd/4th ratio combination without the cost of many premium aftermarket gearsets.
We went beyond the original manufacturer information and physically inspected, counted, measured, and photographed the actual gears in our inventory. The listing photos show the individual gears, caliper measurements, spline openings, tooth profiles, and matched tooth-count combinations.
Gear Ratios 3rd: 1.150 | 4th: 0.909 Verified Tooth Pairing 3rd: 20T / 23T | 4th: 22T / 20T What’s Included 4-piece matched 3rd / 4th gear set Transmission Family Honda/Acura K-Series 6-Speed K20A2 / K20Z1 / K20Z3 applications Drive Type FWD Horsepower Rating No official horsepower rating supplied by OBX. Final durability depends on transmission setup, assembly, power delivery, traction, clutch, tune, and driving conditions. Important - fitment is determined by the transmission, not simply the engine.
A K24 engine swap does not automatically make this set compatible or incompatible. The transmission family and internal gear components are what matter. If your vehicle has been swapped, rebuilt, or fitted with a different transmission, please verify the transmission code before ordering. Confirmed Vehicle Applications
- 2002-2006 Acura RSX Type-S - compatible K20A2 / K20Z1 6-speed applications
- 2006-2011 Honda Civic Si - K20Z3 6-speed applications
Not For These Commonly Confused Applications
- Acura RSX Base / K20A3 5-speed
- 2003-2007 Honda Accord APG6 5-speed
- Other K-Series 5-speed transmissions unless specifically verified
- Swapped vehicles where the installed transmission cannot be confirmed
Physically Verified Gear Pairings 3rd Gear Pair: 23 teeth ÷ 20 teeth = 1.150
4th Gear Pair: 20 teeth ÷ 22 teeth = 0.909 These tooth counts were physically counted on the actual Kuku Performance inventory and independently reproduce the advertised 1.150 / 0.909 ratio combination. Actual Gear Measurements
We photographed each gear with digital calipers showing outside diameter, overall width, and measured inner opening. Please review the measurement photos in this listing if you are comparing these gears against an existing transmission build.
Inner-opening measurements are provided as physical reference measurements only. They should not be interpreted as an official shaft diameter or spline specification.
Installation / Compatibility Notes
- This is a matched 4-piece gear set. All four gears should be used together.
- Do not mix individual gears from this set with unrelated stock or aftermarket 3rd/4th gears from other K-Series transmission families.
- Requires the correct K20A2/K20Z-style 3-4 synchro hub & sleeve (slider) and compatible synchro components.
- Use the appropriate K20A2/K20Z-style 3rd/4th shift fork and inspect existing transmission components for wear during assembly.
- Synchro rings, hub/sleeve, shift fork, bearings, and other transmission components are not included unless specifically shown or stated.
- Professional transmission assembly is strongly recommended.
Performance Ratios Without Premium Gearset Pricing
- Performance-oriented 1.150 3rd / 0.909 4th ratio combination.
- Complete matched 4-piece set instead of sourcing individual used or replacement gears one at a time.
- Actual Kuku Performance inventory has been photographed, measured, and tooth-count verified.
- A significantly more affordable path to this ratio combination than many premium aftermarket K-Series gear solutions.
- Useful for compatible street, performance, turbo, and race-oriented K-Series transmission builds where this 3rd/4th gearing is desired.
Limited inventory available. Once sold out, these will not be restocked. Not sure if it fits your build?
Message us with your: vehicle/year, engine, transmission code, and if available, a photo of your existing 3rd/4th gear stack. We would rather help verify your setup before ordering than have you receive the wrong transmission components.
If you have questions before ordering, hit the Ask a Question button below.
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DEALS Current Deals: Discounts on select items while inventory lasts. View Deals
Shipping & Handling
We ship fast and we ship carefully.
- Orders are inspected, packaged, and ship same day or next business morning.
- Orders placed after 5:00 PM Central ship the following business day.
- Orders placed Friday after 1:00 PM Central are packaged and ready, with carrier pickup on Monday.
- Tracking uploads automatically as soon as your order ships.
- We ship via FedEx, UPS, or USPS depending on size and destination.
Custom Orders & Deals
We can create package deals for multiple items. Message us with what you’re trying to build.
Customer Care (Message Us First)
If there is any issue at all, please contact us first. We respond promptly and handle issues directly.
Details & Notes
- Hardware/accessories are included only if shown or stated.
- Please verify measurements, specifications, and transmission fitment before purchasing.
- Transmission swaps and rebuilt gearboxes can differ from the vehicle's original equipment.
- If you are unsure on compatibility, message us before ordering.
About Us
Automotive enthusiasts focused on quality parts, accurate listings, real measurements, and real communication.
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Returns
If there’s a problem, please message us first. Returns follow ’s policy for this listing.
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