The 2004 Tranzam Sports Sedan Series was an Australian motor racing competition open to Sports Sedans and Trans Am type cars.^[1] The series was administered by the National Australian Sports Sedan Association and was sanctioned by CAMS as a National Series.^[1] Held as the first Tranzam Sports Sedan Series following the discontinuation of the Australian Sports Sedan Championship at the end of 2003, it was won by Darren Hossack driving a Saab 9-3.

The series was contested over five rounds with three races per round.^[1]

The following cars were eligible to compete in the series:^[1]

• Class SS: Space framed Sports Sedans complying with CAMS Group 3D Sports Sedan regulations^[1]
• Class TS: Transam cars complying with regulations for North American Transam competition^[1]
• Class TZ: TraNZam cars complying with the relevant New Zealand regulations^[1]
• Class TA: Australian TA cars complying with National Australian Sports Sedan Association Class TA regulations^[1]

Series points were awarded in each race according to the following criteria:^[1]

In addition, 2 points were awarded for first place in qualifying.^[1]

The above table lists only the top three placegetters.

• Images of Hossack's Saab 9-3 and Ricciardello's Alfa Romeo GTV competing at Oran Park, www.saabcentral.com via web.archive.org