It was therefore decided that the Porsche chassis were to be used as the basis of a new heavy panzerjäger, Ferdinand, mounting Krupp's newly developed 88 mm Panzerjägerkanone 43/2 (PaK 43) D 2030 – 8,8 cm Panzerjägerkanone 43/2 (L/71), Beschreibung, 28.1.1944.