 Instead of scrapping the vehicles altogether, the chassis were used to build a new tank which could be used as a supplement to the newly bought stridsvagn 81.The turret of the strv 74 was completely new, with a 75 mm high-velocity gun based on an old anti-aircraft gun, engines and transmission were modified or changed from the strv m/42, broader tracks and a separate electrical motor for the turret rotation was introduced while retaining the manual control as a backup.The Stridsvagn 74's development path stretches through the Stridsvagn m/40 and m/42 to the original 16,257 kg/16-ton Lago tank, manufactured by the Swedish firm Landsverk for the Hungarian Army.