Parts Now Pay Later with
Log In Cart
Log In

Create An Account

Log In Cart
Your Cart Is Empty
Free Shipping Over $299.99

Free Shipping Over $299.99

Orders of $299.99 or more ship free within the continental U.S.
Shipping to Alaska and Hawaii is additional and not included.
We do not ship international at this time.

Shipping Policy

Synchrotech K20 6-Speed Mainshaft
Part Number: SG-K213-MS

Images may be for reference only

Synchrotech K20 6-Speed Mainshaft
Part Number: SG-K213-MS

Be the first to review!
$439.95 & Free Shipping

Reward Points

It pays to shop with K Series Parts and our reward points program! For every $1.00 you spend you earn reward points.

They are easy to earn, just log in to your account when you check out. If you don't have one it is free and easy to setup.

They are easy to use during check out. Click on the "Have Reward Points?" on the shipping and payment selection page.


Reward Point Program Details

You earn 2 points for every $1.00 that you spend.

100 points equal a $1.00 discount.

Maximum discount per order is 2.5% of the order total.

There is no minimum order total to redeem points.

Points do not apply to shipping or sales tax.

Points are not redeemable for cash.

The point value per dollar, points earned per purchase, and order minimum are subject to change.

Earn 880 reward points. Learn More


Product Details

Part Number: SG-K213-MS
Brand: SynchroTech

The Synchrotech SG‑K213‑MS is a high-performance mainshaft designed for the 6-speed manual transmissions found in 2001–2011 Honda/Acura K20 engines, including models like the RSX, Integra Type R (ITR), Civic Si, and Civic Type R (CTR). Crafted to meet or exceed OEM specifications, this mainshaft is ideal for performance builds, racing applications, or as a direct replacement during transmission rebuilds.

Features:
  • 3.266 ratio 15T 1st / 2.13 ratio 23T 2nd
  • Direct OEM Replacement: Designed as a direct replacement for the factory mainshaft, ensuring compatibility with K20 6-speed transmissions.
  • Precision Engineering: Manufactured with high-quality materials and precise tolerances to maintain the integrity and performance of the transmission.
  • Enhanced Durability: Built to withstand the rigors of high-performance driving, offering increased strength and longevity over stock components.
  • Fitment: Compatible with 2001–2011 K20 6-speed transmissions in various Honda/Acura models, including RSX, ITR, CTR, and Civic Si.
  • Improved Performance: Ensures smooth and reliable power transfer, enhancing overall vehicle performance.
  • Cost-Effective Solution: Offers a high-quality alternative to OEM parts at a competitive price point.
  • Ideal for Rebuilds: Perfect for transmission rebuilds, ensuring your gearbox operates like new.

Due to the manufacturer's price control policy, this item may be excluded from promotions and discounts

WARNING: This product may contain chemicals known to the State of California to cause cancer or birth defects. www.P65Warnings.ca.gov.

Vehicle Fitment

Acura RSX
2002 Acura RSX Type-S
2003 Acura RSX Type-S
2004 Acura RSX Type-S
2005 Acura RSX Type-S
2006 Acura RSX Type-S
Honda Civic
2006 Honda Civic Si
2007 Honda Civic Si
2008 Honda Civic Si
2009 Honda Civic Si
2010 Honda Civic Si
2011 Honda Civic Si

Reviews ★★★★★ ★★★★★

No Reviews Yet!

Write a Review