DETROIT — General Motors Corp. is expected to cut several thousand salaried jobs and further slash truck production in response to falling U.S. sales and Wall Street's demands for more action to stem its losses, according to people briefed on the plan.

GM Chairman and CEO Rick Wagoner was scheduled to discuss the changes at a news conference this morning. GM released no further details, but salaried job cuts and cuts to benefits and executive compensation are likely.

The people briefed on the plan say GM will further reduce its truck production to focus more on small cars, and will likely detail plans to raise more cash to fund its restructuring. The people requested anonymity because the plan was not yet public.

The changes come amid pressure from Wall Street for GM to cut some of its eight brands, but it wasn't clear whether GM would make such an announcement today. The company has said it is exploring the sale of its Hummer brand, but GM's vice president of North American sales, Mark LaNeve, told dealers in a letter last week that no other brands are under such a review.

Just six weeks ago, GM said it will close four truck and sport utility vehicle plants and boost production of the smaller, more fuel-efficient cars that customers are demanding. It also announced production of a new car that could get 45 miles to the gallon and would go on sale in 2010.