Based on the classic T-54, the model received massive screens for the frontal hull armor as well as for the entire turret. Additional screens also appeared along the sides of the tank’s hull.
The 100 mm D-10T gun has been replaced with the British L7 gun, boasting high penetration (268 mm) and projectile velocity, good accuracy (0.33), and aiming time (2.3 s). The price for this unconventional layout is the mediocre gun stabilization in motion and low traverse speed.
Such a serious increase in armor protection affected the vehicle’s weight and, consequently, its mobility, making the T 54D’s specific power (12.9 h.p. per ton) and maximum speed (45 km/h) lower than those of the T54 or T 55A.
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