| Teams 2003 OReilly 400K |
|---|
| No. | Team | Driver | Mfg |
|---|---|---|---|
| 0 | Richardson Motorsports | Patrick Lawler | Chevrolet |
| 1 | Ultra Motorsports | Ted Musgrave | Dodge |
| 2 | Ultra Motorsports | Jason Leffler | Dodge |
| 3 | Team EJP Racing | Eric Jones | Chevrolet |
| 4 | Bobby Hamilton Racing | Bobby Hamilton | Dodge |
| 5 | Rick Ware Racing | Jerry Hill | Dodge |
| 07 | SS Green Light Racing | Stan Boyd | Chevrolet |
| 08 | SS Green Light Racing | Jody Lavender | Chevrolet |
| 8 | Bobby Hamilton Racing | Bill Lester | Dodge |
| 9 | Fasscore Motorsports | Lance Hooper | Ford |
| 11 | Team Chick Motorsports | Aaron Daniel | Ford |
| 14 | Circle Bar Racing | Rick Crawford | Ford |
| 15 | Billy Ballew Motorsports | Rich Bickle | Ford |
| 16 | Xpress Motorsports | Travis Kvapil | Chevrolet |
| 18 | Bobby Hamilton Racing | Chad Chaffin | Dodge |
| 19 | William Lee | Ricky Sanders | Ford |
| 23 | Team 23 Racing | Jamie Aube | Chevrolet |
| 25 | Team Racing | Wayne Edwards | Chevrolet |
| 29 | K-Automotive Performance | Terry Cook | Ford |
| 31 | Brevak Racing | Tina Gordon | Dodge |
| 35 | Pro Motion Motorsports | L.W. Miller | Ford |
| 46 | Morgan Dollar Motorsports | Dennis Setzer | Chevrolet |
| 49 | Mike Star Racing | Shawna Robinson | Chevrolet |
| 50 | Roush Racing | Jon Wood | Ford |
| 53 | Pro Motion Motorsports | Randy Briggs | Ford |
| 58 | Horn Auto Racing | Chris Horn | Chevrolet |
| 59 | HT Motorsports | Robert Pressley | Dodge |
| 62 | Orleans Racing | Brendan Gaughan | Dodge |
| 66 | RDS Motorsports | Donnie Neuenberger | Dodge |
| 72 | MacDonald Motorsports | Randy MacDonald | Chevrolet |
| 75 | Spears Motorsports | David Starr | Chevrolet |
| 81 | Borneman Motorsports | Johnny Borneman III | Ford |
| 86 | Team Racing | Phil Bonifield | Chevrolet |
| 88 | ThorSport Racing | Matt Crafton | Chevrolet |
| 93 | Troxell Racing | Michael Dokken | Chevrolet |
| 99 | Roush Racing | Carl Edwards | Ford |