Chrysler Corp. and the United Auto Workers union worked against a midnight deadline Monday in an effort to reach a new contract covering 63,000 employees.

Bargaining was said to be going slowly, and union and company officials said Sunday night that negotiations were likely to extend into Monday night. Among the major issues hanging up the talks were pensions and health care.Chrysler, the nation's No. 3 automaker, has been under pressure since the union on Friday gave notice that the contract extension under which it has been working since mid-September would expire Monday night.

The union has scheduled a meeting of its 200-member Chrysler bargaining council for Thursday, during which the local presidents and bargaining committee chairmen could get an update on the talks, review a tentative agreement or discuss strike strategy.