Chrysler blew the lid off earnings for 2012, posting a more-than-eightfold improvement in net income to $1.7 billion. But in virtually the same breath, CEO Sergio Marchionne revealed new thin spots in the company's product plans that soon could threaten all over again its tremendous progress of the last few years. The company's earnings report on Wednesday further dimensionalized the truly unexpected success that Chrysler, under Fiat's direction, has accomplished in coming back from the dead in 2009. Revenues for last year were up by 20 percent, to $66 billion; worldwide vehicle sales rose by 18 percent in 2012, to 2.2 million units; cash at year's end was nearly $12 billion, about $2 billion more than a year ago. Chrysler's U.S. sales have grown more than 50 percent since 2010 and its U.S. market share climbed two percentage points, to 11.4 percent. General Motors and Ford didn't gain market share last year.