Auto sales dropped again in November, the major U.S. manufacturers reported Friday as they began retrenching themselves with production cuts, Associated Press (AP) said. The clearest picture of trouble came from Ford, which warned that sagging sales and production cuts in North America and Europe would drop fourth-quarter profits 10 cents a share - or roughly $US190 million - below expectations. It also said it would idle passenger car plants for the last week in December to cut inventories, but declined to be more specific.