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02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission
02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission - image 1 02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission - image 2 02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission - image 3 02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission - image 4 02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission - image 5
Inspected & Documented Condition notes recorded before palletizing.
30-Day Startup Warranty Covers block, heads and internal moving components.
In Stock & Ready to Freight Transmissions

02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission

Brand: Honda
Condition: Used
$1,018.89
+ $185.00 flat-rate insured LTL freight (details)
$1,203.89 delivered to the continental US
  • Palletized and heavy shrink-wrapped for freight
  • LTL carrier delivery with optional liftgate service
  • Ships in 1–2 business days from Los Angeles, CA
  • Transit typically 3–7 business days, continental US
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Details & Inspection Notes

02-05 Honda Civic Si K20A3 5-Speed Manual LSD Transmission (K-Swap Gearbox)

Upgrade your Honda project with a genuine JDM 02-05 Honda Civic Si Manual Transmission (K20A3, 5-Speed with LSD). Perfect for K-Swap builds, this gearbox provides smooth shifting, durability, and improved traction thanks to its Limited Slip Differential (LSD).

Key Features

  • Fitment: 2002-2005 Honda Civic Si (EP3)
  • Engine Compatibility: K20A3, K20A, K24A
  • Transmission Type: 5-Speed Manual (MT, Cable Operated)
  • Differential: Factory LSD (Limited Slip Differential)
  • Condition: JDM Imported, low mileage, fully tested

Why Choose This K20A3 LSD Gearbox?

The K20A3 5-Speed LSD Transmission is one of the most popular choices for K-Swap projects into older Honda chassis, including Civic EK, EG, DC2 Integra, and CRX. The factory LSD provides better grip and traction for street and track driving compared to open differentials, making it an ideal upgrade for enthusiasts.

Applications

  • Direct fit for 2002-2005 Honda Civic Si (EP3)
  • Compatible with K-Swap projects (Civic, Integra, Accord, CRX)
  • Works with K20A3, K20A, and K24 engine swaps

Helpful Resources

K20A.org, K-Swap Community ·

Startup & Installation Checklist

  • Replace timing components, water pump and plugs before initial startup where applicable.
  • Refill all fluids with manufacturer-specified oil and coolant.
  • Verify sensors, ECU pinouts and grounds against your chassis or hull wiring.
  • Startup warranty covers heads, block and internal lubricated components for 30 days from delivery.

Full terms: 30-day startup warranty · returns

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