The financial arms of Chrysler LLC and General Motors Corp. are getting out of the business of leasing vehicles as credit tightens and resale prices for gas-quaffing trucks fall, according to company executives and independent sources. The move, effective Aug. 1, could spark a backlash among dealers and consumers. In Canada, an estimated 43% of drivers lease their vehicles, double the U.S. rate of 20%. Chrysler told dealers in Canada and the United States that Chrysler Financial will stop offering financing for vehicle leases, steering buyers into low-interest loans to buy the vehicle outright, sources said. Dealers wanting to offer the leasing option would have to find their own source of financing, Chrysler said.