The T-54D tank project was part of the FRG program to modernize foreign T-54 (T-55) tanks. With a certain increase in weight, the vehicle received protective blocks that significantly increased its anti-HEAT protection and improved protection against kinetic projectiles. It was suggested to replace the 100 mm D-10T gun with the more modern 105 mm L7A3, as the British gun was superior to the Soviet gun in both armor penetration and accuracy. Upon request, MG 3 machine guns could be mounted on the tank, and its outdated communications equipment, observation devices, and aiming units could be modernized. No prototypes were built.