The Sam's Town 400 is a NASCAR Craftsman Truck Series race that takes place at Texas Motor Speedway.

Chex 400K

* 2005 Jack Sprague

O'Reilly 400K

* 2004 Dennis Setzer
* 2003 Brendan Gaughan
* 2002 Brendan Gaughan
* 2001 Jack Sprague

Pronto Auto Parts 400K

* 2000 Greg Biffle
* 1999 Dennis Setzer
* 1998 Tony Raines
* 1997 Kenny Irwin, Jr.

Two racetracks formerly on the NEXTEL Cup schedule were closed to make room for Texas Motor Speedway's two race dates, with the North Wilkesboro Speedway being bought by TMS owner Bruton Smith and New Hampshire International Speedway owner Bob Bahre. The track was closed with one of the tracks two dates going to both new owners. The North Carolina Speedway in Rockingham, North Carolina was also sold to Smith as a result of the Ferko lawsuit with the tracks one remaining date also being handed over to Texas.

Texas Motor Speedway is home to two NASCAR Nextel Cup races: the Samsung/Radio Shack 500 and the Dickies 500, as well as two Busch Series Races, the O'Reilly 300 and the O'Reilly Challenge and last but not least, the Indy Racing League race, the Bombardier Learjet 550.

For a short time during construction in September 1996, the track's name was changed to Texas International Raceway. SMI's customary track naming convention had planned to have the "Motor Speedway" as part of the name. However, in August 1996, a small quarter-mile dirt raceway in Alvin, Texas (now known as Texas Thunder Speedway) had filed suit to use the name. On December 2, 1996, a settlement between the two tracks saw the "Texas Motor Speedway" name reinstated to the 1.5 mile oval, and the small number of Texas International Raceway mechanise instantly become collectible.

One key characteristic of Texas are the tunnel bumps in Turns 2 and 4 which give unquiness to the is 1.5 mile downforce "cookie cutter" racetrack.