The US T20 Medium Tank was developed as a replacement to the US Army M4 Sherman as the Sherman entered production. Various mock ups with both 75mm and 76mm main guns were built as the T20E1. The T20E2 had a 77mm main gun. The engine was a V-8 supplied by Ford. The T22 was built by Chrysler with a different transmission.  The later T23 entered production but were rejected by the US Army for front line service.

The US T20 Medium Tank Spec’s

Armament: x1 76mm M1 main gun  / x2 7.62mm MG’s / x1 12.7mm MG
Armour: 64mm (steel)
Crew: 5
Dimensions: Length 5.5m / Width 2.78m / Height 2.4m
Weight: 30.13 tonne
Engine: Ford GAN V-8 petrol 470hp
Speed: 40km/h
Range: 161km