Restore factory performance to your Mazda 6 with this JDM 4-speed automatic transmission for the 2003–2004 model years, designed to work with the 2.3L 4-cylinder L3 / L3DE engine.

This is a used Japanese Domestic Market (JDM) automatic transmission, imported directly from Japan, pulled from low-mileage donor vehicles. It’s a perfect match for your front-wheel-drive (FWD) Mazda 6 and ideal for replacing worn or failing U.S.-spec gearboxes.

✅ Compatibility:

• 2003 Mazda 6 2.3L DOHC 4-Cyl (L3/L3DE FWD Automatic)

• 2004 Mazda 6 2.3L DOHC 4-Cyl (L3/L3DE FWD Automatic)

This transmission is not compatible with 3.0L V6 or manual transmission models.

Whether your current unit suffers from delayed shifts, slipping, or total failure, this JDM 4-speed automatic transmission delivers a direct bolt-on solution. Expect better reliability thanks to lower mileage and improved maintenance standards typical of vehicles in Japan.

At J-Spec Auto, all transmissions are:

• Tested prior to removal

• Visually inspected

• Leak-checked and cleaned

• Packaged securely on a pallet for delivery

• Backed by a startup warranty (see terms)

In most cases, you may need to reuse some U.S.-spec sensors or brackets to ensure plug-and-play compatibility.

✅ Key Features:

• Genuine JDM 4-Speed Automatic Transmission

• Fits L3 / L3DE 2.3L DOHC 4-cylinder engine

• For FWD 2003–2004 Mazda 6

• Direct OEM replacement

• Low mileage, clean, and Japan-imported

✅ Primary Keywords:

• Mazda 6 2.3L automatic transmission

• JDM L3DE 4-speed auto gearbox

• 2003 2004 Mazda 6 transmission for sale

• JDM FWD automatic transmission Mazda 6

• L3 engine transmission replacement

✅ Secondary Keywords:

• Used Mazda 6 L3 4-speed automatic JDM

• Mazda 6 FWD transmission swap

• 2.3L JDM Mazda gearbox replacement

• JDM auto trans for 4-cylinder Mazda

• Mazda L3DE 4AT import transmission