The 2003 Ford Explorer used automatic transmissions: a five-speed automatic for the 4.0-liter V6 and a four-speed automatic for the 4.6-liter V8.
In more detail, transmission choices were tied to engine options and drivetrain configuration. The 4.0L V6 typically paired with Ford’s five-speed automatic (the 5R55-series family), while the 4.6L V8 used a four-speed automatic (the 4R70W family). Exact specifications can vary by whether the vehicle is two-wheel drive or four-wheel drive and by production date, so it’s best to verify the exact unit via the transmission identification tag or the VIN for your specific vehicle.
Transmission options by engine
Below are the two main engine-transmission pairings you would find in a 2003 Explorer.
- 4.0L SOHC V6 — five-speed automatic with overdrive (transmission family: typically 5R55S/E).
- 4.6L SOHC V8 — four-speed automatic (transmission: commonly 4R70W).
These pairings cover the standard 2003 Explorer lineup. The exact transmission can vary by drivetrain (2WD vs. 4WD) and production date, so confirm using the transmission tag or the vehicle’s VIN if you need a precise specification.
How to verify your specific transmission
If you want to confirm which unit is installed in your exact vehicle, use these steps to identify it.
- Inspect the transmission tag on the side of the unit for a code such as “5R55S” or “4R70W.”
- Check the vehicle’s VIN and build sheet or consult Ford’s service database to confirm the original transmission for your exact VIN.
- Look at the number of forward gears by testing the shifter positions or consulting the owner’s manual; five forward gears indicate a 5-speed, four forward gears indicate a 4-speed.
- If in doubt, have a qualified technician read the transmission code or use a scan tool to pull the transmission type from theController.
Knowing the exact transmission helps with maintenance, parts compatibility, and potential replacement decisions.
Summary
For the 2003 Ford Explorer, the transmission depended on the engine: a five-speed automatic for the 4.0L V6 and a four-speed automatic for the 4.6L V8. Common designations are the 5R55S/E family for the V6 and the 4R70W family for the V8, though variations can occur with drivetrain and production date. Always verify with the transmission tag or VIN to be certain of the exact unit in your vehicle.