The first in a series of 1942–1943 U.S. medium tank designs intended as replacements for the M4 Sherman. The first prototype was produced in May 1943, and trials went on until 1944. The vehicle was not approved for mass production, but subsequent prototypes, the T22 and T23, were created on the basis of this development. They, in turn, served as precursors of the T25 and T26. Eventually, the M26 Pershing emerged on their basis and was adopted for service.
HVSS T48
Ford GAA
SCR 506
T20D1
76 mm Gun M1A1E20
HVSS T51
Ford GAN
T20D2
90 mm Gun M3
Characteristics are specified for vehicles with crews trained to 100%.