Paccar Inc posted a higher-than-expected quarterly profit on Tuesday as trucking companies in North America, encouraged by the economic rebound, falling fuel prices and rising freight volumes, updated their fleets. The Bellevue, Washington-based truck- and engine-maker company posted a third quarter profit of $371.4 million, or $1.04 a share, up from $309.4 million, or 87 cents a share, during the comparable quarter last year. Third quarter net sales and financial services revenues rose 15 percent to $4.93 billion. Analysts, on average, expected the company to report a profit of 96 cents a share, according to Thomson Reuters I/B/E/S.