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Greg Biffle replaces crew chief

CHARLOTTE, N.C. -- Greg Erwin will be replaced as the crew chief for Greg Biffle for Sunday's race at New Hampshire Motor Speedway.

The decision was made after Biffle finished 21st in Saturday night's race at Kentucky Speedway to fall to 14th in points, 33 out of the top 10 guaranteed a spot in the Chase. He hasn't had a top-10 finish in the past five races.

Matt Puccia will replace Erwin. Puccia has been a part of Roush Fenway Racing as a crew chief in the Nationwide and Truck Series. He worked with Paul Menard in the Nationwide Series in 2010.

"This is a natural progression of our crew chief development and I have every confidence that he will do well in this new role," team owner Jack Roush said in a news release of Puccia. "Greg Erwin has made a significant contribution to our engineering efforts and our program is better because of him."

Erwin and Biffle have been together since May of 2007. Biffle is in danger of missing the Chase for the first time since 2007 with only one top five and five top 10s in 18 races.

"I am excited for the opportunity to work with Matt Puccia," Biffle said in the statement. "Greg Erwin led this team to the Chase the past three years and I look forward to Matt doing the same."

Biffle's three RFR teammates -- Carl Edwards, Matt Kenseth and David Ragan -- are in the Chase that will be set in eight races.

David Newton covers NASCAR for ESPN.com. He can be reached at dnewtonespn@aol.com.