13, 2011 All about the 1960 Impala. The 1959 Chevrolet Impala was radically reworked sharing bodyshells with lower-end  Buicks  and Oldsmobiles  as well as with  Pontiac , part of a GM economy move, Chevrolets rode a wheelbase 11/2 inches longer than before. Atop a new X-frame chassis, roofs sat three inches lower,