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Product Details
| Part Number: | SO-K20-1C |
| Brand: | SynchroTech |
| Transmission: | Manual |
Synchrotech SO-K20-1C – 1st/2nd Gear Carbon Synchro & Sleeve Set for K-Series A premium-grade transmission upgrade that combines Pro Series carbon synchros, hardened slider sleeve, and springs—all meticulously engineered for 1st and 2nd gear applications in Honda/Acura K-Series manual transmissions.
Fitment:
- 2002–2006 Acura RSX Base & Type-S
- 2001–2006 JDM ITR/CTR
- 2006–2011 Civic Si (DC5, EP3, etc.)
- Additional K20/K24 manual transmission models
- Suitable for both 5-speed and 6-speed variants
Features:
- Premium Carbon Synchronizers: Carbon-lined syncros offer enhanced friction, faster engagement, and superior durability compared to traditional brass designs—ideal for spirited driving or performance-oriented builds.
- Durable Hardened Sleeve: Designed for the rigors of frequent gear shifting, the hardened steel sleeve ensures wear resistance and the structural integrity of the synchronization mechanism.
- Value-Priced Performance: The kit is a smart investment for restoring or enhancing shift feel in critical lower gears.
Includes:
- Pro Series carbon syncros for 1st and 2nd gears
- Synchro springs for both gears
- Hardened steel sleeve for 1st/2nd gear assembly
- This all-in-one set streamlines the synchronization upgrade process.
The Synchrotech SO-K20-1C Carbon Synchro & Sleeve Set is the ideal solution for those seeking to enhance or restore transmission performance in Honda/Acura K-Series 5- and 6-speed gearboxes. Featuring high-friction carbon lining, a rugged hardened sleeve, and all essential components for 1st and 2nd gear, this set delivers smooth, confident shifting and long-term reliability.
WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.
Vehicle Fitment
| Year | Make | Model | Trim | Notes |
|---|---|---|---|---|
| 2002 | Acura | RSX | Base | Manual |
| 2002 | Acura | RSX | Type-S | Manual |
| 2002 | Honda | Civic | Si | Manual |
| 2003 | Acura | RSX | Base | Manual |
| 2003 | Acura | RSX | Type-S | Manual |
| 2003 | Honda | Civic | Si | Manual |
| 2004 | Acura | RSX | Base | Manual |
| 2004 | Acura | RSX | Type-S | Manual |
| 2004 | Acura | TSX | Base | Manual |
| 2004 | Honda | Civic | Si | Manual |
| 2005 | Acura | RSX | Base | Manual |
| 2005 | Acura | RSX | Type-S | Manual |
| 2005 | Acura | TSX | Base | Manual |
| 2005 | Honda | Civic | Si | Manual |
| 2006 | Acura | RSX | Base | Manual |
| 2006 | Acura | RSX | Type-S | Manual |
| 2006 | Acura | TSX | Base | Manual |
| 2006 | Honda | Civic | Si | Manual |
| 2007 | Acura | TSX | Base | Manual |
| 2007 | Honda | Civic | Si | Manual |
| 2008 | Acura | TSX | Base | Manual |
| 2008 | Honda | Civic | MUGEN Si | Manual |
| 2008 | Honda | Civic | Si | Manual |
| 2009 | Honda | Civic | Si | Manual |
| 2010 | Honda | Civic | Si | Manual |
| 2011 | Honda | Civic | Si | Manual |
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