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

Parts & Accessories

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Honda

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

SKU 306449945515

$1,018.89

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Warranty

No warranty

Commercial use may carry a shorter period than pleasure use.

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Freight

Freight — oversize — from $349. Ships in 1–3 business days, 3–10 business days in transit.

Freight damage must be noted on the delivery receipt and reported within 48 hours of delivery.

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30-day return window · 25% restocking fee plus freight both ways.

Engines or transmissions that have been disassembled or parted out cannot be returned.

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Some engines and transmissions carry a refundable core charge, shown on the product page where it applies.

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Catalogue data

Specification

8 fields

Part number
306449945515
Brand
Honda
Department
Parts & Accessories
Condition
Used: An item that has been used previously. The item may have some signs of cosmetic wear, but is ... Read moreabout the conditionUsed: An item that has been used previously. The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or store return that has been used. See the seller’s listing for full details and description of any imperfections. See all condition definitionsopens in a new window or tab
Brand
Honda
Type
Manual Transmission
Gear Count
5
Country/Region of Manufacture
Japan

In the seller's words

Description

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 ·
Hondata ECU Tuning ·
Shop More JDM Transmissions

What’s Included

  • 02–05 Honda Civic Si K20A3 5-Speed LSD Transmission
  • SPTM cable gearbox assembly
  • LSD (Limited Slip Differential) pre-installed
  • Clutch housing (where applicable)
  • Shift linkage not included (sold separately)

Note: Professional installation is strongly recommended. Please confirm compatibility with your ECU, mounts, and clutch system before purchase.

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