Short answer: It could be a five-speed manual or a four-speed automatic, depending on the trim and market.
The 2007 Mazda3, part of Mazda's first-generation lineup, offered two main transmission choices to suit different driving styles. The sporty Mazda3 S typically paired with a manual gearbox, while the majority of base and mid-range models used a four-speed automatic. Transmission availability could vary by region and production date, so checking the specific vehicle's build sheet or VIN is the best way to confirm.
Transmissions offered in the 2007 Mazda3
Manual transmission
Manual gearboxes were most commonly found with the sportier S trim and the 2.3-liter engine configuration, offering a more engaged driving experience.
- 5-speed manual transmission (5MT) — commonly paired with the 2.3L engine on the Mazda3 S; preferred by enthusiasts for a connected, hands-on shift.
In most markets, the 5-speed manual was the sole manual option during 2007, with select trims offering it as a factory configuration or as a lower-cost option on the sportier models.
Automatic transmission
Automatic configurations used a four-speed automatic transmission, widely available across i and S trims with both the 2.0L and 2.3L engines. No CVT was offered that year.
- 4-speed automatic transmission (4AT) — standard or widely available on most 2007 Mazda3 trims; no CVT was offered that year.
The four-speed automatic was the common choice for daily commuting, delivering smooth shifts and acceptable fuel economy for its era.
Summary
For the 2007 Mazda3, the transmission options were a five-speed manual (primarily with the sportier Mazda3 S) and a four-speed automatic (common across most trims). No continuously variable transmission or higher-speed automatics were offered that model year. Always verify the exact configuration for a given vehicle, as regional variations existed.