Chrysler's new business plan will be presented by the end of November and will show numbers and the path out of years of difficulties, the company's chief executive said on Wednesday.

Sergio Marchionne, who is also head of Italian car maker Fiat , told reporters at the Frankfurt Motor Show the restructuring of Chrysler was more difficult than he initially thought.

Fiat took a 20 percent stake in the struggling U.S. auto maker in return for its technology to build smaller, greener cars.

Marchionne said U.S. industry-wide auto sales should top 11 million units in 2010. He said he saw much better volumes for 2010 for the industry there.

(Reporting by So Young Kim; Editing by Jon Loades-Carter)

Chrysler