| Teams for 2003 OReilly 400K |
|---|
| Car | Team | Driver | Mfg |
|---|---|---|---|
| 0 | Richardson Motorsports | Patrick Lawler |  |
| 1 | Ultra Motorsports | Ted Musgrave |  |
| 2 | Ultra Motorsports | Jason Leffler | |
| 03 | Team EJP Racing | Eric Jones | |
| 4 | Bobby Hamilton | Bobby Hamilton | |
| 5 | Rick Ware | Jerry Hill | |
| 07 | Gene Christenson | Stan Boyd | |
| 8 | Bobby Hamilton | Bill Lester | |
| 08 | Gene Christenson | Jody Lavender | |
| 9 | Fasscore Motorsports | Lance Hooper |  |
| 11 | Steve Chick | Aaron Daniel | |
| 14 | Tom Mitchell | Rick Crawford | |
| 15 | Billy Ballew | Rich Bickle | |
| 16 | Steve Coulter | Travis Kvapil | |
| 18 | Bobby Hamilton | Chad Chaffin | |
| 19 | James Murphy | Ricky Sanders | |
| 23 | Team 23 Racing | Jamie Aube | |
| 25 | Team Racing | Wayne Edwards | |
| 29 | Bob Keselowski | Terry Cook | |
| 31 | Brevak Racing | Tina Gordon | |
| 35 | Mary Ward | L.W. Miller | |
| 46 | Morgan-Dollar Motorsports | Dennis Setzer | |
| 49 | Mike Starr | Shawna Robinson | |
| 50 | Jack Roush | Jon Wood | |
| 53 | Mary Ward | Randy Briggs | |
| 58 | Horn Auto Racing | Chris Horn | |
| 59 | James Harris | Robert Pressley | |
| 62 | Orleans Racing | Brendan Gaughan | |
| 66 | MLB Racing | Donnie Neuenberger | |
| 72 | MacDonald Motorsports | Randy MacDonald | |
| 75 | Wayne Spears | David Starr | |
| 81 | Borneman Motorsports | Johnny Borneman III | |
| 86 | Team Racing | Phil Bonifield | |
| 88 | Duke Thorson | Matt Crafton | |
| 93 | Lonnie Troxell | Michael Dokken | |
| 99 | Jack Roush | Carl Edwards | |
