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]
| Round | Circuit[2] | Date | |
| 1 | Mallala Motor Sport Park | 9 May | |
| 2 | Winton Motor Raceway | 6 June | |
| 3 | Oran Park Raceway - South Circuit | 27 June | |
| 4 | Eastern Creek International Raceway | 1 August | |
| 5 | Oran Park Grand Prix Circuit[3] | 13 November |
The following cars were eligible to compete in the series:[1]
Series points were awarded in each race according to the following criteria:[1]
| Position | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th | 11th | 12th | 13th | 14th | 15th | Other finishers | |
| Points | 20 | 18 | 15 | 136 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 |
In addition, 2 points were awarded for first place in qualifying.[1]
| Position | Driver | No. | Car | Entrant | |
| 1 | Darren Hossack | 4 | Saab 9-3 Aero Chevrolet[4] | Audi Spares | |
| 2 | Tony Ricciardello | 5 | Alfa Romeo Alfetta GTV Chevrolet | B&M Ricciardello Motors | |
| 3 | Bernard Gillon | 3 | Ford Mustang Cobra | Powerbuilt Tools |
The above table lists only the top three placegetters.