You yourself said the Churchill and Comet.....just reinforcing.
The M3 Grant/Lee was a bad tank. This are the speicifacations i have on it:
Country of Origin: U.S.A.
Type: medium tank
In Service: 1941-1944
Combat Weight: 60,000 lbs.
Dimensions: lenght 18.5 ft.; width 8.9 ft.; height 10.3 ft.
Engine: Wright Continental R-975-EC2 nine-cylinder air-cooled
petrol engine (340hp @ 2400 rpm)
Perfomance: road speed 26mph; cross-country speed 16mph' range 120 miles; trench 6.3ft; gradient 60%
Ground Pressure: 13.4lb/sq in
Power-to-Weight: ratio 12.7hp/ton
Armour: 0.5in minimum; 1.5in maximum
Weapons: 1 x 75mm M2/M3 gun(hull sponson); 1 x 37mm M5/M6 gun in turret; 1 x 0.30in M1919A4 coaxial MG; 2 x 0.30in M1919A4 MG in bow(fixed mounting)
Ammunition: 75mm - 41 rounds
(the British version also had a .30 on the turret roof)