Greg Irwin has re-signed with Richard Petty Motorsports, according to FoxSports.com. Erwin joined the No. 43 team in the middle of the season, after being replaced by Matt Puccia as Greg Biffle’s crew chief at Roush Fenway Racing. Erwin led AJ Allmendinger to a 15th place finish in the points standings, a career-high for Allmendinger.