The 2005 Samsung / Radio Shack 500 was a Nextel Cup event held at Texas Motor Speedway on April 17, 2005. Greg Biffle had to start in the rear due to an engine failure, but still spent most of the race up front, leading 219 of the 334 laps in route to victory on Jamie McMurray. Points leader Jimmie Johnson finished 3rd to protect a 135-point edge on Biffle. Stats