ARMY PICKS CHRYSLER TO DEVELOP NEW TANK AT $4.9 BILLION COST
US Army selects Chrysler to develop and build 3,312 Abrams tanks at estimated cost of $4.9-billion; Defense Sec Donald H Rumsfeld refused to accept Army's original recommendation to award contract to GM, and ordered it to reopen competition between 2 cos so that they could modify proposals to incorporate standard components of Leopard 2 tank being built by W Ger; 2d Chrysler proposal would allow US and Ger tanks to use essentially same fuel, ammunition, guns, tracks and power plants; Army Sec Martin R Hoffmann says new tank, called Abrams in hon of late Gen Creighton W Abrams, has greater battlefield effectiveness, less operating costs, easier maintenance and lower price than GM version; Lycoming Div of Avco is awarded $60-million contract for gas turbine engine to be used in Chrysler design; illus of Abrams and Leopard tanks (M)