His 2011 season was threatened when his new team, Richard Petty Motorsports, ran into financial trouble after defaulting on its $90 million loan earlier this year.
However, his ride has been guaranteed by the sale yesterday of Richard Petty Motorsports assets to an investment group with seven-time NASCAR champion Richard Petty as chairman.
"Obviously it's a great relief to have my future secured. I can't wait for the year to kick off in earnest at Daytona in February," said Ambrose who cancelled his usual return to Australia for Christmas to help his new team sort out its financial woes.
"We have a point to prove in 2011. It's my third year in the top NASCAR's elite level, and our aim is to win races and make the end-of-year Chase."
Ambrose won the 2003 and 2004 V8 Supercar championship driving a Gold Coast-based Stone Brothers Racing Ford and has finished his fifth year of NASCAR racing in 26th place in the Sprint Cup driving a Toyota Camry. He will line up next year in a Ford Fusion alongside 2004 Champ Car World Series Rookie of the Year A.J. Allmendinger.