Ralph E. Reins will resign as chairman,...

Ralph E. Reins will resign as chairman, president and chief executive of Mack Trucks Inc. of Allentown, Pa. Reins, 50, has accepted a position as president of the automotive group at United Technologies Corp. of Hartford, Conn. Reins is expected to take his new job Oct. 29. Reins will be replaced at Mack by an executive from Renault Vehicules Industriels, according to Bob Nuss, owner of Rochester Mack in Rochester, Minn., and chairman of the council that includes 200 Mack dealers. RVI on Oct. 5 completed its $107-million buyout of the 55% of Mack stock that it had not previously owned.