General Motors Corp. voted yesterday to continue its 60-cents-a-share quarterly dividend, while GM and other automakers released production figures indicating declining output during April.

GM's board of directors voted to pay the 60-cent dividend rate, in effect since the second quarter of 1980, on June 10 to shareholders of record May 13.

In other corporate action, GM said it had elected two new vice presidents as part of a reorganization of vehicle and manufacturing engineering activities at the GM Technical Center.

GM Chairman Roger Smith said James D. Johnston was elected vice president in charge of the industry-government relations staff. Robert J. Eaton was elected vice president in charge of the engineering staff.

Johnston, 51, has been director of government relations heading the staff's Washington office since April 1976. He will continue to be in Washington and will report to David S. Potter, vice president and group executive in charge of the public affairs group. Johnston succeeds Robert Magill, 65, who is retiring.

Eaton, 42, has been director of reliability for GM's Oldsmobile Division in Lansing, Mich., since Feb. 1. Eaton succeeds Frank J. Winchell, 64, who is retiring.

The Technical Center reorganization involves restructuring engineering and manufacturing staffs, Smith said.

"This new organizational format is aimed at strengthening our technical position in product design and manufacturing," Smith said. "It is important to have forward product engineering move ahead concurrently with the newest ideas in manufacturing engineering."

GM's output for April was 288,937, down from 394,575. Ford Motor Co. reported its April production also declined, to 132,648 from 142,077. Chrysler's output declined to 62,389 from 83,540.