The following are known GameShark Codes for NASCAR Thunder 2004 on Sony Playstation (PS1).
These codes were also known as Action Replay Codes and in most cases will work on both devices.

These codes are for the U.S. version of the game.

• Always 1st Place
  8002F5BC 0001
• Always On Lap Modifier
  8002F5B8 00??
• Start On Lap Modifier
  D002F5B8 0001
  8002F5B8 00??