The game features 2002 Winston Cup champion Tony Stewart on its cover, chosen to embody the new Grudges and Alliances mechanic that was the game's headline addition. It includes career mode, season mode, a Lightning Challenge mode drawing on real incidents from the 2002 and 2003 Winston Cup seasons, a SpeedZone skills mode, and a Thunder License tutorial mode narrated by NASCAR legend Richard Petty. NASCAR Thunder 2004 is an EA Sports Bio game, making it compatible with other EA Bio titles such as Madden NFL 2004 and NCAA Football 2004.
The defining new system tracks the player's on-track behaviour and its effect on relationships with rival drivers. Bumping a competitor, even accidentally, creates a Grudge, and that driver will actively target the player when their paths cross later in the race. Drafting behind a rival reduces grudge severity, while sustained drafting of a neutral driver converts them into an Ally who will offer racing room. Bumping an Ally degrades the relationship. Severity values run from -100 for maximum grudge to +100 for maximum alliance. In Season and Career modes, these relationships carry over between races, creating a persistent social dimension across the season.
Career mode tasks players with building a custom driver's reputation, attracting sponsors, and developing garage equipment. Season mode allows play as either a custom or real driver across a configurable schedule. SpeedZone is a dedicated skills arena covering passing, blocking, and drafting as well as time trials. Lightning Challenge recreates specific situations from the 2002 and 2003 Winston Cup seasons, presented with Michael Waltrip as an in-game reporter; completing challenges unlocks Thunder Plates that open additional tracks, fantasy drivers, Busch Series drivers, and historical legends. Online racing with microphone support was available on PC and PlayStation 2 versions.
NASCAR Thunder 2004 received strong reviews. IGN scored the PlayStation 2 version 8.8 out of 10, praising the sound design, QuickSave feature, and microphone support, noting the driving model leaned toward accessibility over realism. IGN awarded the PC and Xbox versions 8.5 each. GameSpot called it the equivalent of Tony Hawk or Madden within its genre, scoring it 8.8 and awarding a Metacritic aggregate of 88. GameZone was the most reserved, scoring it 8.4.
At the 2003 Spike Video Game Awards, NASCAR Thunder 2004 won the award for best racing game of the year, making it the only NASCAR game to receive a Spike VGA award. It was also nominated for The Electric Playground's 2003 Best Driving Game for PC and Best Console Driving Game awards, losing to Need for Speed: Underground and Project Gotham Racing 2 respectively.
NASCAR Thunder 2004 is remembered as the peak of the EA Sports NASCAR series in terms of critical reception and feature ambition. The Grudges and Alliances system was a genuine mechanical innovation for the genre, adding a persistence and rivalry dimension rarely attempted in licensed racing games of the era. Its Spike VGA recognition placed it alongside mainstream gaming titles at a time when racing games were rarely acknowledged at major awards shows. The game also represents a bookend for the original PlayStation as a NASCAR gaming platform, closing that chapter of the franchise's hardware history.