Kurt Busch's crew chief departs Penske Racing

Steve Addington will not return as crew chief for Kurt Busch's No.22 Dodge at Penske Racing in 2012, the team announced Tuesday.

Addington had served as Busch's crew chief since the start of the 2010 Sprint Cup Series season. The two won four races and claimed five poles together. They also made the Chase for the Sprint Cup championship last year and this season. Busch finished the 2011 season 11th in points, one spot ahead of his younger brother, Kyle.

"Steve Addington is no longer with our organization," Penske Racing president Tim Cindric posted on the team's Twitter account. "We appreciate the successes we experienced together and wish him well in his future endeavors."

Addington paired with Kyle Busch at Joe Gibbs Racing prior to his arrival at Penske.

There is wide speculation that Addington will join Stewart-Haas Racing as crew chief for Tony Stewart's championship-winning No.14 team. Stewart clinched his third Sprint Cup title with a win in Sunday's season-ending 400-mile race at Homestead-Miami Speedway.