Greg Biffle came to Roush Racing from the short tracks of the Northwest and quickly made a name for himself when he took the 1988 Rookie of the Year Award in the NASCAR Craftsman Truck Series. He went on to win the truck series championship two years later and captured the Busch Series Rookie of the year honor in 2001. In 2002, Biffle became the first driver to win both the Craftsman Truck and Busch Series Championships. He accomplished a life-long goal in 2002 at Daytona with his first NASCAR Nextel Cup Series victory. In 2003 Biffle added two more wins to his Cup record but nothing would compare to the 2005 season when he ran away with five wins in the first 15 races. Biffle added one more victory at Homestead to become the winningest driver of the 2005 NASCAR Nextel Cup season. He finished secong in the points to to Tony Stewart, missing his third NASCAR Championship by only 35 points.

Since joining Roush acing in 1988, Biffle has clearly shown that NASCAR racing is his forte. Even before becoming a member of the Roush stable, Biffle was recording impressive statistics in other racing series, including NASCAR Winston Racing Series Championship ar Portland SPeedway and Tri-Cities Raceway. It wasn't until his rookie season in the NASCAR Craftsman Truck Series, however, that he truly began making a name for himself.

Biffle caught the eye of NASCAR Hall-of-Farmer Benny Parsons during the 1995/96 NASCAR Winter Heat Series, which proved to be the key that opened the door to what has been a remarkable carrer to date. Parsons told Jack Roush that there was o way he could pass up the chance to hire Biffle, and that if he did he would regret it while watching Biffle win races for another team owner.

In 1997, Grainger Industrial Supply went to Roush Racing for advice on how to build a motorsports platform that would work for their business. The recommendation was to become a primary sponsor in the building NASCAR Craftsman Truck Series, and to latch on to an up and coming driver. Biffle was the guy, and since the two hit the track together in 1988, they have become one of the most sucessful combinations in NASCAR.

During his rookie campaign in the truck series, Biffle established a rookie record for Bud Pole positions with four. Only Biffle's teammate Kurt Bush was able to tie that record in 2000, but no other rookie driver has been able to top it. Biffle also led at least one lap in 12 different events that season and recorded eight top-five and 12 top-10 finishes en route securing the Cintas Rookie-of-the-Year honors.

The following year was the breakthrough year for Biffle and the Grainger team in the truck series. He captured his first carrer series win a Memphis MOtorsports Park, and went on to set a series record for mine wins in a single season. Biffle finished the year second in the overall points standings, just eight points shy of a championship.