The Object 430U is a version of the Object 430 medium tank with a rear placement of the engine-transmission compartment. This version was to feature a transverse placement of the engine and two planetary transmissions. This technical solution allowed for extending the interior space and decreasing the vehicle's weight. This vehicle was developed from 1953 through 1957 to replace the T-54, but the work was discontinued in favor of the Object 432 in 1961.

This tank is literally a "Heavy Medium" tank with various characteristics from both a heavy tank and a medium tank mixed together. It has decent mobility, but not as good as other mediums, good armour protection, but not as good as other heavies, and relatively good gun handling considering its mobility and armour. It's best played as spearhead tank that can lead a charge , or as an anti-medium that can fight well against lights and mediums due to its good armour, mobility and firepower.