The T34 Heavy Tank was a prototype heavy tank developed as a “middle ground” between the T29 and T30 Heavy Tanks in 1945. While the trio shared similar designs, the T34 was armed with the experimental 120 mm T53 anti-tank gun derived from the 120 mm M1 super-heavy AA gun, which offered a balance between the firepower of the 155 mm-armed T30 and the rate of fire of the 105 mm-armed T29. Two T34 prototypes were built using converted T30 chassis in 1948. Despite the T53 gun proving to be powerful enough to deal with any tanks at that time, it suffered from excessive recoil and fumes collected in the turret; gunnery trials at Fort Knox causing the loaders to be hospitalised due to these issues. This, combined with the excessive weight of the T29 series in general, led to the cancellation of the entire project in 1950 in favour of the lighter and better-armoured M103 Heavy Tank. A single prototype of the T34 was preserved at the U.S. Army Armor and Cavalry Collection in Fort Benning, Georgia.

Introduced in Update 1.67 “Assault”, the T34 presents a radical new tank design, more so than any of its predecessors. The T34’s most notable feature is its large, heavily armoured turret housing the exceptionally powerful 120 mm gun, capable of penetrating any tanks it could face. Its survivability is decent, as the crew of six are placed far apart from each other, meaning that it is unlikely to be knocked out in one hit. Although the top speed is limited, the T34 is decently mobile for its size and weight. However, the T34 is not without weaknesses: its armour still has some glaring weak spots, especially the gun mantlet, hull machine gun port, turret roof, as well as the ammo rack on turret cheeks. The gun also has a fairly long loading time. Because of this, the T34 excels in medium-to-long range engagements, where its weaknesses can be somewhat mitigated.