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

This is a used JDM-imported 5-speed manual gearbox pulled from a 2002-2005 Honda Civic Si (EP3), built around the K20A3 engine code and fitted with a factory limited slip differential rather than an open diff. It's cable-operated, which matters if you're swapping it into a chassis set up for a different shift linkage.

Who this fits

Beyond the direct EP3 fit, this gearbox is a common choice for K-swap builds into older Honda chassis such as the Civic EK, Civic EG, DC2 Integra, and CRX, where it's paired with K20A3, K20A, or K24A engines. The factory LSD is the main draw for swap builds, since it gives more consistent traction under power than an open differential, which matters most in cornering or hard acceleration.

Before you buy

Confirm your engine code and shift linkage match a cable-operated K-series gearbox before ordering, since mounting and clutch hardware differ across Honda chassis generations. As a used, imported unit, expect normal wear consistent with a tested, running transmission rather than new-condition cosmetics; confirm exact mileage and inspection details with us before ordering.

Common questions

Does it include a limited slip differential? Yes, this is the factory LSD version rather than an open diff.

Will it bolt into an Integra or EK Civic? It's commonly used in those K-swap builds alongside the direct EP3 fit, but confirm your specific mounts and linkage first.